For one thing, not having to enchant a permanent is huge, as your foe cant remove it in response, and the ability to duplicate any nonland permanent you have as opposed to just a creature or artifact is massively strong
Were going for a straight-through life gain, so Ill recommend one of the following three commanders: White-Black White Black Youll have a lot of triggers to keep up with, but thats what life gain is all about
Can he bring his low-level dorm, Slifer Red, to the top of the Deck
The card's effect is pretty great too, as it encourages you to stack your opponent up with status effects, such as the poison Sneasler inflicts with Poison Claws, before dropping a Dire Claw to deal big damage
You could change Villain for any other creature type and it would essentially be the same