Cancer Deck Breakdown

WATER 4

If "Umi" is on the field (Quick Effect): You can target 1 WATER monster you control, except "Doom Kraken", and 1 monster your opponent controls; Special Summon this card from your hand, and if you do, return that monster you control to the hand, and if you do that, destroy that opponent's monster. When an opponent's monster declares an attack: You can return this card to the hand, and if you do, negate that attack. You can only use each effect of "Doom Kraken" once per turn.

WATER 4

You can send 1 "Umi" from your hand, Deck, or face-up field to the GY; Special Summon 1 WATER monster from your hand. When your opponent activates a monster effect, or Spell Card or effect, while "Umi" is on the field (Quick Effect): You can negate that effect, then, you can make this card gain 600 ATK/DEF. You can only use each effect of "Electric Jellyfish" once per turn.

EARTH 2

During either player's turn: You can send this card from your hand to the Graveyard; this turn, each time your opponent Special Summons a monster(s), immediately draw 1 card. You can only use 1 "Maxx "C"" per turn.

WATER 7

If "Umi" is on the field: You can activate this effect; your WATER monsters can attack directly this turn. During your opponent's Battle Phase (Quick Effect): You can target 1 face-up monster your opponent controls; destroy it. If this card on the field is destroyed by battle or card effect: You can either add to your hand or Special Summon 1 WATER Warrior monster from your Deck or GY. You can only use each effect of "Mega Fortress Whale" once per turn.

WATER 5

While "Umi" is on the field, each player can only control 1 face-up non-WATER monster. (If a player controls 2 or more, they must send some to the GY so they only control 1.) During your Main Phase: You can add from your Deck to your hand 1 "Umi", 1 "Kairyu-Shin" Spell/Trap, or 1 "Sea Stealth" Spell/Trap. You can only use this effect of "Ocean Dragon Lord - Kairyu-Shin" once per turn.

WATER 5

This card's name becomes "The Legendary Fisherman" while on the field or in the GY. While "Umi" is on the field, this card is unaffected by other monsters' effects. If this face-up card is destroyed by battle, or leaves the field because of an opponent's card effect while its owner controls it: You can add 1 Level 7 WATER monster from your Deck to your hand.

WATER 7

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 1 "The Legendary Fisherman". When this card is Special Summoned: You can banish all monsters your opponent controls, also this card cannot attack this turn. Cannot be destroyed by battle or card effects, also unaffected by Spell/Trap effects. Once per turn: You can return as many of your opponent's banished cards as possible to their GY, and if you do, the first battle or effect damage your opponent takes this turn becomes doubled.

FIRE 3

When a card or effect is activated that includes any of these effects (Quick Effect): You can discard this card; negate that effect. ● Add a card from the Deck to the hand. ● Special Summon from the Deck. ● Send a card from the Deck to the GY. You can only use this effect of "Ash Blossom & Joyous Spring" once per turn.

Spell Field

(This card's name is always treated as "Umi".) All WATER monsters on the field gain 200 ATK/DEF. Reduce the Level of all WATER monsters in both players' hands and on the field by 1.

Spell Quick

Target 1 monster in your opponent's GY; banish it, and if you do, until the end of the next turn, its effects are negated, as well as the activated effects and effects on the field of monsters with the same original name.

Spell Normal

Add 1 Level 7 or lower monster from your Deck to your hand, that mentions "Umi", or is a WATER Normal Monster, then if "Umi" is on the field, you can Special Summon 1 WATER Normal Monster from your Deck. You can only activate 1 "Fish Sonar" per turn.

Spell Normal

Send 1 Spell/Trap from your Deck to the GY. You can only activate 1 "Foolish Burial Goods" per turn.

Spell Normal

Add 1 "Torrential Tribute" from your Deck to your hand. If a WATER monster(s) you control would be destroyed by card effect, you can banish this card from your GY instead. You can only use each effect of "Fury of Kairyu-Shin" once per turn.

Spell Normal

At the start of your Main Phase 1: Banish 3 or 6 random face-down cards from your Extra Deck, face-down; draw 1 card for every 3 cards banished. For the rest of this turn after this card resolves, you cannot draw any cards by card effects.

Spell Normal

Banish 3 or 6 cards of your choice from your Extra Deck, face-down; for the rest of this turn after this card resolves, any damage your opponent takes is halved, also excavate cards from the top of your Deck equal to the number of cards banished, add 1 excavated card to your hand, place the rest on the bottom of your Deck in any order. You can only activate 1 "Pot of Prosperity" per turn. You cannot draw cards by card effects the turn you activate this card.

Spell Continuous

This card's name becomes "Umi" while on the field or in the GY. Your opponent cannot target WATER monsters you control with non-WATER monster effects. At the start of the Battle Phase: You can Special Summon from your hand or GY, 1 monster that mentions "Umi", or 1 WATER Normal Monster, in Defense Position, but destroy it at the end of the Battle Phase. You can only use this effect of "Sea Stealth II" once per turn.

Trap Normal

If your opponent controls a card, you can activate this card from your hand. When a card or effect is activated that includes an effect that Special Summons a monster(s): Negate that effect, then if you have a Trap in your GY, destroy that card. If you activated this card from your hand, you cannot activate the effects of LIGHT, EARTH, and WIND monsters for the rest of this Duel. You can only activate 1 "Dominus Impulse" per turn.

Trap Normal

When an attack is declared involving your opponent's monster: Change that opponent's monster's ATK to 0, negate its effects, also it cannot change its battle position. You can banish this card from your GY; send 1 Level 5 or higher WATER monster from your Deck to the GY, then, you can add 1 WATER monster from your GY to your hand, also, until the end of your next turn after this effect resolves, you cannot Special Summon monsters, except WATER monsters. You can only use this effect of "Ice Barrier" once per turn.

Trap Continuous

When this card is activated: You can activate 1 "Umi" from your hand or GY. While "Umi" is on the field, this face-up card gains these effects. ● Once per turn: You can banish 1 WATER monster you control until the End Phase; this turn, face-up Spells/Traps you control cannot be destroyed by your opponent's card effects (even if this card leaves the field). ● At the start of the Damage Step, if your WATER monster whose original Level is 5 or higher battles an opponent's monster: Destroy that opponent's monster.

Trap Normal

When a monster(s) is Summoned: Destroy all monsters on the field.

DARK 6

If you have no cards in your GY (Quick Effect): You can send this card from your hand to the GY; until the end of the next turn, any card sent to the GY is banished instead.

EARTH 4

If this card is flipped face-up: Destroy all Special Summoned monsters on the field. Neither player can Special Summon monsters.

LIGHT 10

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by sending 3 face-up Continuous Spell Cards you control to the Graveyard, and cannot be Special Summoned by other ways. If this card destroys an opponent's monster by battle and sends it to the Graveyard: Inflict 1000 damage to your opponent. While this card is in face-up Defense Position, monsters your opponent controls cannot target monsters for attacks, except this one.

LIGHT 4

Cannot be Normal or Special Summoned if you control a monster. Neither player can activate monster effects unless the number of monster effects that player has previously activated that turn is less than the number of monster card types currently on the field (Ritual, Fusion, Synchro, Xyz, Pendulum, and Link). (If an effect's activation was negated, it still counts toward the total for that turn. Only count effects that were activated while this monster was face-up on the field.)

EARTH 2

During either player's turn: You can send this card from your hand to the Graveyard; this turn, each time your opponent Special Summons a monster(s), immediately draw 1 card. You can only use 1 "Maxx "C"" per turn.

LIGHT 11

During the Main Phase, if your opponent Normal or Special Summoned 5 or more monsters this turn (Quick Effect): You can Tribute as many face-up monsters on the field as possible, and if you do, Special Summon this card from your hand, then Special Summon 1 "Primal Being Token" (Rock/LIGHT/Level 11/ATK ?/DEF ?) to your opponent's field. (This Token's ATK/DEF become the combined original ATK/DEF of the Tributed monsters.) You can only use this effect of "Nibiru, the Primal Being" once per turn.

DIVINE 10

Cannot be Special Summoned. Requires 3 Tributes from either side of the field to Normal Summon to that side of the field (cannot be Normal Set), then shift control to this card's owner during the End Phase of the next turn. Cannot attack. Your opponent cannot target this card for attacks or by card effects. You can Tribute this card; Special Summon 1 "The Winged Dragon of Ra" from your hand or Deck, ignoring its Summoning conditions, and if you do, its ATK/DEF become 4000.

LIGHT 3

When a monster on the field activates its effect, or when a Spell/Trap that is already face-up on the field activates its effect (Quick Effect): You can send this card from your hand or field to the GY; destroy that card on the field. You can only use this effect of "Ghost Ogre & Snow Rabbit" once per turn.

Spell Normal

Draw until you have 3 cards in your hand, also for the rest of this turn after this card resolves, your opponent takes no damage. During the End Phase of this turn, send your entire hand to the GY. You can only activate 1 "Card of Demise" per turn. You cannot Special Summon during the turn you activate this card.

Spell Equip

If the equipped monster battles your opponent's monster, during damage calculation: The equipped monster's ATK/DEF become equal to the ATK or DEF (whichever is higher) of the opponent's battling monster +100, during damage calculation only. If this face-up card is sent from the field to the GY: Pay 500 LP; place this card on either the top or bottom of your Deck.

Spell Normal

At the start of your Main Phase 1: Banish 3 or 6 random face-down cards from your Extra Deck, face-down; draw 1 card for every 3 cards banished. For the rest of this turn after this card resolves, you cannot draw any cards by card effects.

Trap Normal

Target 1 monster on the field; return that target to the hand.

Trap Continuous

Activate by targeting 1 face-up monster your opponent controls; take control of that monster. While you control that monster, it cannot attack or activate effects. When that monster leaves the field, destroy this card.

Trap Counter

When your opponent activates a Spell/Trap Card: Your opponent draws 1 card, also negate the Spell/Trap activation, and if you do, destroy it.

Trap Normal

If your opponent controls a card, you can activate this card from your hand. When a card or effect is activated that includes an effect that adds a card(s) from the Deck to the hand: Negate that effect, then if you have a Trap in your GY, destroy that card. If you activated this card from your hand, you cannot activate the effects of DARK, WATER, and FIRE monsters for the rest of this Duel. You can only activate 1 "Dominus Purge" per turn.

Trap Counter

When your opponent activates a monster effect on the field: Negate the activation, and if you do, destroy that card, then, you can apply the following effect. ● Banish 1 monster from your hand, and if you do, Special Summon the monster that was destroyed and sent to the GY by this effect to your field, but negate its effects. You can only activate 1 "Draco-Utopian Aura" per turn.

Trap Normal

At the end of the Battle Phase, if your opponent controls more cards than you do: You can make your opponent banish cards from their field face-down so they control the same number of cards as you do. If you control no cards, you can activate this card from your hand.

Trap Normal

Target 1 face-up monster your opponent controls; negate its effects (until the end of this turn), then, if this card was Set before activation and is on the field at resolution, for the rest of this turn all other Spell/Trap effects in this column are negated. If you control no cards, you can activate this card from your hand.

Trap Continuous

When this card resolves: You can Special Summon 1 "Helios - The Primordial Sun" from your hand or Deck. While this card is face-up on the field, any card sent to the Graveyard is banished instead.

Trap Counter

When a monster(s) would be Summoned, OR a Spell/Trap Card is activated: Pay half your LP; negate the Summon or activation, and if you do, destroy that card.

Trap Counter

When a monster(s) would be Special Summoned, OR a monster effect is activated: Pay 1500 LP; negate the Summon or activation, and if you do, destroy that card.

Trap Normal

When an opponent's monster declares an attack: Return all your opponent's Attack Position monsters to the hand.

Trap Continuous

Each player can only control 1 monster of each Type. If a player controls 2 or more monsters of the same Type, they must send some to the GY so they control no more than 1 monster of that Type.