Zerg Lair

{t}: Add {b}{g} or {b}{u}.

Larva Incubation - At the beginning of combat if this land wasn't tapped for mana, add 2 Larva counter to this land.

Mutate into Hive - At the beginning of your upkeep if this land has over 5 larva counters, you
may choose to remove all larva counters and transform this land into a Zerg Hive.