Paladin, the Platinum Dragon

flying
Paladin, the Platinum Dragon's power and toughness are each equal to the difference between each opponent's life total, and your life total.
If Paladin, the Platinum Dragon's power and toughness would ever be one or less, transform it.
when Paladin, the Platinum Dragon becomes the target of a spell or ability an opponent controls, exile it with with three myth counters on it, whenever a player casts a spell remove a myth counter from it then if there are none, return it to the battlefield.