Hells Wrath

When Hells Wrath enters the battlefield, Destroy all non-flying creatures, then create 7 1/1 black demon creature tokens with flying and haste.
-At the beginning of your upkeep, create a 6/6 black demon creature token with flying.
-Whenever one or more creatures attack you, Hells Wrath deals X damage to those creatures where X is the number of demons you control.
-Sacrifice 3 demons:destroy target permanent.