Thought Harvester

A win condition that strips the opponent's library one card at a time, but exiles rather than mills: the top card leaves the game entirely, so the effect sidesteps graveyard recursion and any payoff the opponent might build around a stocked bin. Devoid is the keyword that makes the trigger reliable. In a colorless Eldrazi shell, the spells you cast are colorless by design, so the condition stops being a hoop and becomes a near-guarantee. The load-bearing word is cast: this rewards spells hitting the stack, not mana abilities, so sacrificing a token for mana does nothing to feed it. What feeds it is the deck's actual casting volume: colorless ramp, generic-costed beaters, the cheap filler that floods the board, each one shaving a card off the opponent's deck. The 2/4 flier is built to survive long enough to capitalize, blocking most early aggression while chipping in over the top, committing the deck to a clock that empties a library rather than swinging for lethal. That makes it an odd finisher, one whose loop has nothing to do with combat math and everything to do with how many spells you can chain together. The reach is real but narrow: one exile per cast adds up only if the spells keep coming, so the design quietly demands a deck that plays out cheap and often rather than one durdling toward a single haymaker. Its enabler and its payoff are folded into the same deckbuilding choice.