The Kingdom of Mirkwood Elves

The Kingdom of the Mirkwood Elves enters the
battlefield tapped.
{2},{t}: Add {g} for each Elf you control.
{6}{g}{g},{t}, Sacrifice The Kingdom of the
Mirkwood Elves: Elf creatures you control get
+5/+5 and gain trample until end of turn.
Activate this ability only any time you could cast
a sorcery