Invasion of Tarkir // Defiant Thundermaw (mom)

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When Invasion of Tarkir enters the battlefield, reveal any number of Dragon cards from your hand. When you
do, Invasion of Tarkir deals X plus 2 damage to any other target, where X is the number of cards revealed this way. (X can be 0.)
//
Flying, trample
Whenever a Dragon you control attacks, it deals 2 damage to any target.