Immortal Phoenix Gearfried (x3)
Gearfried does everything you want while the skill complements it perfectly, what more could you want
First, it's super super easy to summon. It can be special summoned by banishing an Equip Spell from the grave. The skill that does this is easily maxed out.
Once it is on the field with the equip spell from the skill equipped to it (or any Equip card) it will be extremely strong thanks to the 2nd effect which allows us to Negate + Destroy 1 Monster by bringing 1 Equip Spell from the field. It is strong because it is not too difficult to Equip Gearfried to get the Negate Monster ability, because we have the 3rd effect.
The third effect of this card is when we use this card to punch a monster, we can use that monster as an equipment for Gearfried. This sounds amazing because it can almost counter all types of protection such as target, cannot be destroyed,... (except for the Uneffected ability that is not affected by some cards). It can only Equip 1 monster at a time, so when negate, remember to use the enemy's monster that is Equip.
There are 2 more things I want to mention here . Because it can Equip ANY monster, don't hesitate to Equip your own monster if you have enough damage to kill opp, and of course it can negate handtraps like Kiteroid. And of course, the Get Monster to Equip effect happens during the Damage Step, so if you are choosing a target to attack a monster, then you steal that monster, you won't be able to attack anymore, so try to choose a monster to take away that isn't the card you are playing.