Flying Squirrels' Revenge

Create X 1/1 green Squirrel creatures with
flying, where X is the greatest power among attacking creatures your opponents control.
This spell cost {x} less to cast, where X is the
greatest power among attacking creatures your opponents control.
"I am the most powerful of the Eldrazi. I cannot be destroyed, not even by the gods."
"We are a bunch of flying squirrels, and we shall
destroy you."