Hive Swarm

Enchant land you control.
Enchanted land has "{t}: Add {1}{s}"
{1}{t}: Create a 0/1 colorless Spor Mine creature
with flying.
{3}{t}: Create a 2/1 black Tyranid creature token
with flying.
{6}{t}: Create a 5/5 black Tyranid creature token
with trample.
Activate only as a sorcery.