Slifer, The Sky Dragon

•Hexproof & Protection from Noncreature spells
Flying
If you cast this card for its casting cost, it cannot
be countered. If you did not, sacrifice this card.
When an opponent puts a creature onto the battlefield they get -5/-5. If they would die this
way, exile it. This card gains +X/+X where X
is the number of cards in your hand.
"When you hear a roar followed by cracking thunder,
run!" - Fearful Villager