Doom Whisperer

The price is the whole mechanism: two life per activation, no cap, no tap, no summoning sickness on the ability itself. A 6/6 flier with trample is already a clock that forces an answer, but the surveil engine is what turns that body into a payment structure. Each activation digs two cards deep, lets you bin what you do not want and bank what you do on top of your library, and life is the only resource you spend. Against a slow opponent you can run the ability repeatedly in a turn, filtering toward your best draws or stocking a graveyard for reanimation and delve while the demon kills them in the air. It sits inside a long black-magic tradition: life as renewable currency, the demon that hands you selection in exchange for the thing you have most of and need least when you are ahead. What sharpens it past the usual life-for-cards rate is what surveil does with each look. You are not gambling on the top card the way a Necropotence or Greed deck does; you choose, two at a time, which cards stay on top to be drawn and which go straight to the yard as fuel. The restraint is self-imposed. Nothing stops you from surveiling down to a lethal life total, so the ability reads as engine and liability in the same clause, a demon that lets you kill yourself faster than the opponent can.