Taris, Dragon Soul

Flying
Taris, Dragon Soul enters the battle with X metamagic counters on it. Whenever you cast an instant or sorcery spell, you can spend one metamagic counter in addition to its mana cost. If you do so, put that card back into your hand rather than your graveyard. The next time you cast that spell, exile the card instead.
{t}{3}, Put one metamagic counter on Taris, Dragon Soul.