Slifer the Sky Dragon

Cannot be countered.

Flying, Hexproof, Indestructible. You have no max hand size.

Sacrifice 3 creatures as an additional cost to cast Slifer the Sky Dragon. At the beginning of end step sacrifice Slifer the Sky Dragon if it was not cast.

Slifer the Sky Dragon gets +1/+1 for each card in your hand. Whenever a creature an opponent controls enters the battlefield, roll a D6 and Slifer the Sky Dragon deals damage equal to the result to that creature.