Tainted Pact

Built as graveyard-light card selection at a time when most digging tools fed the yard, this sifts through your library for any single card while quietly stacking a pile in exile, but the price it demands shapes how you build. The process stops the instant you put a card into your hand, and it also stops the instant you exile two cards sharing a name. Hit a duplicate before you find what you want and you fizzle with nothing; the spell never lets you bank a card and keep digging past it. Crucially, the name check covers everything exiled, basic lands included, so a second Swamp ends the search just as surely as a second copy of a spell. The natural conclusion is a true singleton list with no repeated cards of any kind, where the engine becomes a guaranteed two-mana tutor that can strip the entire library at instant speed. That deckbuilding constraint is where this stopped being a quirky selection spell and became a combo enabler: pair it with a payoff that wants an empty library, and the "draw nothing, exile everything" outcome flips into the win condition. Instant speed compounds the danger, letting you assemble a kill on an opponent's end step rather than telegraphing it during your own draw step. The no-duplicates tax has kept it confined to the formats willing to pay it.