Slifer the Sky Dragon

Flying
Slifer the Sky Dragon can't be countered
You may sacrifice three creatures to pay for {2} when casting this creature
Slifer the Sky Dragon's power and toughness are
equal to the number of cards in your hand
{1}{b}{r}, Discard a card: Slifer the Sky Dragon
deals X damage to target creature, where X is the number of creatures that entered the
battlefield this turn. If that creature died from
this damage, draw two cards