Blackwing Assault Dragon

As an additional cost to cast this spell
you may exile a Bird Warrior with
mana value 6 or greater and a
Bird dragon with mana value 8 or greater
from your graveyard. if you do cast
this spell without paying its mana cost.
Whenever an opponent activates the ability
of a monster they control , they lose 3 life.
if this is the 4th time this ability has resolved
this turn destroy all cards on the field.