Grothk, Sunborn Golem

Trample
Rust : Whenever Grothk deals combat
damage to a creature put a Rust counter
on it. If the creature has three or more Rust counters it gets -6/-0.
{1}{r/g}{t}: Artifact creatures you control get
Rust until end of turn.
"Rusted swords will be all that remains."
-Book of Toth