Note that I look at cards that interact in some way with actual card draw
Blue and green have a lot of ways to manipulate the top of your deck with cards like Sylvan Library, Brainstorm, Augur of Autumn, and Ponder
Whenever you cast a noncreature spell, create a 1/1 white Ally creature token
From the mirrored artwork to the powerful multiplicative effects, the whole cycle seems like a slam dunk for Double Masters
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Black has gotten straight 2/2 creatures for one mana with much better drawbacks than Accursed Centaur