Alduin, Twilight God

Flying
Whenever you sacrifice a permanent, put a
+1/+1 counter on Alduin, Twilight God
Whenever Alduin, Twilight God attacks, you
may pay {2}. If you do, create a 4/4 red dragon creature token with flying.
{2}{u/b}: Sacrifice a dragon you control. Double
Alduin, Twilight God's power until end of turn.
Sacrifice an artifact: Destroy target nonland
permanent an opponent controls.