The Ferryman

+1: Create a tapped powerstone token (it's an artifact with tap for colorless, this mana can't be spent to cast a nonartifact spell.)
-1: Pay any amount of mana. Look at that many cards from the top of your library, put one in your hand and the rest on the bottom of library randomly
-7: You get an emblem with "Tap an untapped artifact you control: this emblem deals 1 damage to any target."