Slifer the Sky Dragon

Flying Indistructable
As an additional cost to cast Slifer the Sky Dragon, sacrafice 3 creatures.
Slifer's power and toughness are equal to the
number of cards in your hand.
Creatures your opponents control get -2/-0
If a creature your opponent controls has 0 or less power, destroy it.
When Slifer attacks you may draw 2 cards, if you
do, discard a card.