Psychic Spiral

Most mill-as-a-finisher cards run one direction: grind the opponent's library down and hope they deck out first. This one inverts the math by feeding on your own discard pile. It shuffles everything you've buried back into your deck, then turns that count against the opponent, so the spell scales with how much you've thrown away rather than how much mana you commit. The deckbuilding tension is the whole appeal: every spell already cast, every card a self-mill engine has dumped, every fetched land that hit the bin becomes ammunition. The payoff is two-sided and entirely in your favor. Only your graveyard returns to your library, refueling you against your own deck running thin, while only the opponent takes the mill. The same cast is both the kill and the safety valve. Played late, after a self-mill build has churned through twenty or thirty cards, it converts a graveyard nobody else cared about into a single instant-speed strike large enough to empty a library in one resolution. The instant timing is what makes it lethal rather than merely large: you can hold it for the opponent's end step, after they have committed their resources for the turn, so the mill resolves and their next draw step comes up against an empty library. They lose on the draw, with no untap window to find an answer first.