Disciple of Tevesh Szat

A repeatable pinger built on subtraction rather than burn: tap it, and any creature shrinks by a point until end of turn. That tap-to-shrink line does the same work a damage-pinger does (clearing a one-toughness army, finishing what combat started, sniping a mana dork), but it routes through -1/-1 instead of damage, which means it sidesteps indestructibility and damage prevention while running headlong into anything that cares about toughness loss. The 3/1 body is the honest tax on that engine: it dies to the very effects it hands out, so an opponent's own pinger or any one-power attacker trades with it cleanly. The second ability is where the card stops being a repeatable nuisance and becomes a one-shot removal spell: pay the steep cost, sacrifice the engine, and hand a creature -6/-6 until end of turn, enough to bury most things while neatly dodging regeneration and the "non-lethal damage" loophole. Note the timing wrinkle: both abilities are instant-speed, so the small drain can ambush a combat trick by killing the attacker before damage, and the sacrifice mode can answer a creature at the worst possible moment for its controller. The cost structure tells you which one is the plan and which is the panic button: the cheap drain is the daily grind, the sacrifice is the exit you take when you need a body gone and are willing to spend the engine to do it.