Creep Tumor

Creep Expansion - {t}: Add {b}.

Creep Spread - {1}{b}, {t}: Create a 1/1 black Zerg creature token. Activate only if you control a Zerg creature and only once each turn.

Creep Infestation - {3}{b}, {t}, Sacrifice Creep Tumor: Destroy target non-Zerg creature. Create a 1/1 black Zerg creature token.

"The Creep spreads, consuming all in its path."