Hedorah, the Smog Monster

Wither

Whenever one or more nontoken creatures with -1/-1 counters on them die, create a tapped 1/1 black ooze creature token with Wither. This ability triggers only once each turn.

Hedorah, the Smog Monster gets +X/+X, where X is the number of -1/-1 counters on other nontoken creatures.

All life doomed as a hideous monster is spawned in the filth of pollution