Arboreal Alliance

When Arboreal Alliance enters the battlefield,
create an X/X green Treefolk creature token.
Whenever you attack with one or more Elves, populate.
We come, we come with horn and drum:
ta-runa runa runa rom! To Isengard! Though Isengard
be ringed and barred with doors of stone; Though
Isengard be strong and hard, as cold as stone and
bare as bone, We go, we go, we go to war, to hew the
stone and break the door; For bole and bough are
burning now, the furnace roars - we go to war!