Decimator Beetle

The clever part of this design is that it weaponizes a mechanic that usually shrinks your own board. A -1/-1 counter is normally a liability, something opponents force onto your creatures to whittle them down; here it becomes ammunition you carry and relocate. The enter trigger looks like a cost, saddling a creature you already control with the shrink, but it is really loading the chamber: that counter is exactly what the attack trigger picks up and fires across the table. The natural homes are creatures that treat counters as fuel rather than damage, which is why this slots into shells built around -1/-1 synergies, where stockpiling and moving counters is the whole point. The maneuver is one-for-one each swing rather than a runaway shrink-everything machine, but the attack trigger is more forgiving than it first reads. Because it has no "if you do" clause, the two halves are independent: you can aim the removal at a creature with nothing to remove, remove nothing, and still hand a defending creature the shrink. That turns the attack trigger into a turn-by-turn pinger the moment the Beetle declares an attack, with the counter-relocation as upside rather than a prerequisite. The 4/5 body is sturdy enough to keep swinging into most blockers and survive, which matters for an engine whose payoff repeats every attack step. It does very little in a deck that ignores counters and quietly excellent work in one built to feed them.