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Rules Text

<i>(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.)</i>

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. <i>(X can be 0.)</i>