Zerg Hive

Zerg Spawn Pools - {t}: Add {b} or {g}.

Endless Swarm - {2}, {t}: Create a 1/1 black Zergling creature token. Activate only if you control a Zerg creature.

Hive Evolution - {4}{b}{g}, {t}, Sacrifice a Zerg: Create two 1/1 black Zergling creature tokens, then put a +1/+1 counter on each Zerg you control.

"The Hive never sleeps. The Swarm never ends."