Deep-Eyes White Dragon

Flash, Flying
Deep-Eyes White Dragon enters the battlefield
with a number of +1/+1 counters on it equal to
the power of target white dragon in your
graveyard, and it deals 1 damage to target
opponent equal to the number of white dragon
cards in your graveyard.
When this card is destroyed by an opponent's
spell or activated ability, destroy all creatures
your opponents control.