Pain Seer

Creature — Human Wizard    (CMC:2)

Inspired — Whenever Pain Seer becomes untapped, reveal the top card of your library and put that card into your hand. You lose life equal to that card's converted mana cost.

80 Game Day BNG ★ ENMark Winters

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Legal in: Modern,Theros Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

1/1/2014
If the mana cost of the revealed card includes , X is considered to be 0.
1/1/2014
If the revealed card doesn’t have a mana cost (because it’s a land card, for example), its converted mana cost is 0.
1/1/2014
Split cards in your library have two converted costs, one for each half. If you reveal a split card this way, you’ll lose life equal to the sum of those converted mana costs.