Harvest Gwyllion

Wither turned the -1/-1 counter from a one-shot removal effect into a recurring combat mechanic, and a sturdy 2/4 that applies it on every swing is the most efficient way to mine that design for value. The math is cynical: when this connects in combat, its two damage lands as two permanent -1/-1 counters, so the creature on the other side walks away smaller and stays that way. Block a 3/3 and it goes home a 1/1, then dies to the next pinprick; the counters land regardless of who is attacking, so blocking this shrinks the blocker just the same. The four toughness is what keeps the engine running: it takes normal combat damage like any creature, but enough body to survive the early exchanges and outlast the things it has been quietly grinding down. The hybrid white-black cost reflects two appetites for that work: white wants the patient wall that never trades down, black wants the slow erosion of an opposing board. Either way, the counters do not wear off between turns, so the threat compounds the longer the game runs. What it offers is a way to win the grind rather than the race, by ensuring every creature it touches is worth less the next time it has to fight.