Don't Mess With Squirrels

As an additional cost to cast this spell, sacrifice ten Squirrels.
If five or more Squirrels were destroyed this turn by a source an opponent controls, you may cast this spell for free.
Create a 10/10 Black Demon Dragon With Flying, Trampel, and "This creature has +1/+1 for each Squirrel card in play, in all graveyards, and in exile."
At the beginning of your next turns end step, you lose the game.