Akiri, Line-Slinger & Glacian, Powerstone Engineer Sacrifice Sacrificing permanents for value is always fun in EDH, whether it's creatures, artifacts, or anything really (except lands, that's for crazy people)
(You do not use "Polymerization".) During either player's turn, when your opponent activates a Spell/Trap Card, or monster effect: You can discard 1 card
The Leaders released in Starter Decks include: Monkey D
Balance makes it laughably easy to come back from what should be an otherwise unwinnable position, allowing you to reset a game state no matter how far behind you are
Load up with phoenixes, dragons, or even The Locust God and get to 100% fast
The rest treat a slab like a raw card, which gives you a price that can be off by an order of magnitude