Slifer the Sky Dragon

Tribute 3 (You may cast this card by sacrificing three
non-token creatures rather than paying its mana cost
and if you do it cannot be countered.)
Shroud, Flying
This creature's power and toughness are each
equal to the number of cards in your hand.
Whenever a creature enters the battlefield under
an opponent's control it gets -2/0 and if its
power is 0 destroy it.