Celestial Dragon of Osiris

Flying, Hexproof, Vigilance, Protection from
Instants and Sorceries, Can't be countered
This card gains +2/+2 for every card in its
controller's hand.
The controller of this card has no maximum
hand size.
When a creature or planeswalker enters the battlefield under an opponent's control,
this creature does 3 damage to it.
If this creature destroys a card, you draw a card.