Slifer The Sky Dragon

You must send Three Creatures you controle to the Graveyard in addition to Casting This. No other cards or effect can activate and/or be cast in response to this being Cast. If this is Summoned Without being Cast from the Hand, then it is sent to the Graveyard at the end of the turn.
This Creature's Attack and Toughness is Always Equal to the amount of Cards in your Hand.
When your Opponent Summons a Creature, it gets -4/0, if its attack becomes 0 because of this effect, then it is Destroyed.