Necroplasm

A board sweeper with a clock running underneath it, and the clock starts at zero. The end-step trigger fires on an empty count the turn it lands, so the first wave destroys every creature with mana value 0: tokens, mostly, plus the odd Ornithopter. The next upkeep adds a counter and the destruction climbs to the one-drops, then the twos, then the threes, ascending one slot at a time until the wave is sweeping curve positions the table has long since stopped playing. That ascending erasure makes it a strange, indirect kind of removal: you pick which mana value the wave deletes only by choosing when to cast the creature, since the trigger is mandatory and the number marches upward without ever resetting. The genuinely brutal part is the self-immolation built into the math: it costs three mana, so the turn it reaches three counters, the end-step trigger destroys every three-drop, itself included. It cannot grow past its own destruction; the sweep eventually catches the sweeper. Dredge 2 is the answer to that suicide clause. Lose it to its own trigger (or to anything else) and you mill two to return it to hand, then pay to recast it, resetting the timer to zero and starting the ascending wave over from the bottom. The recursion turns a self-incrementing counter into repeatable, climbing removal, with milled cards as the fuel that keeps the loop alive: an attrition engine that outlasts incremental destruction by simply refusing to stay dead.