Invasion of Tarkir // Defiant Thundermaw
Battle — Siege // Creature — Dragon{1}{R}
(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 this Siege enters, reveal any number of Dragon cards from your hand. When you do, this Siege 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.
Colour identity Red · Flying, Transform, Trample
In short
Invasion of Tarkir // Defiant Thundermaw has 2 listed printings; the most valuable is the Prerelease printing from PMOM at US$6.99 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
