Siege of Winterfell

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it is defeated, exile it, then cast it transformed.)

When Siege of Winterfell enters the battlefield, reveal any number of Dragon cards from your hand. When you do, Siege of Winterfell deals X plus 2 damage to any other target, where X is the number of cards revealed this way. (X can be 0.)