Gadreel, Scourge's Rage

Gadreel, Scourge's Rage costs {1} less for each
creature you control that attacked this turn.
Double Strike
Whenever Gadreel deals combat damage to a
player, create that many 2/2 red ghost pirate
creature tokens. If 10 or more tokens are created
this way, there is an additional combat phase after
this one.