Quarry Colossus

The word that separates this from destruction is "library." Most white answers at this size kill or exile; this one buries a creature on the battlefield back into its owner's deck, beneath the top X cards, where X scales with how many Plains you control. A mono-white board can plant the target so deep it functions like removal for the rest of the game, while a thin manabase leaves it shuffling back near the top for a quick redraw. That depth is the whole transaction, and it is what makes the effect honest: it is a tempo play, not a clean answer. A token simply ceases to exist; a real threat gets delayed, not destroyed. What the tuck does that destruction cannot is sidestep the graveyard entirely. It exiles nothing, so it never feeds a recursion deck the fuel it wanted filled; it triggers no "when this dies" payoff; and it neutralizes a creature your opponent intended to rebuy from the yard by routing it back into the library instead. The 5/6 frame is the rest of the bargain: at seven mana you are paying for a sturdy blocker that happens to inconvenience one creature, not for a removal spell with a body bolted on. It reads sharpest against the single-threat opponent and the graveyard-reliant one, and the Plains rider quietly taxes the splash, rewarding the player who committed fully to one color over the one who hedged.