Voidcaster

Whenever Voidcaster enters the battlefield, you may discard a card. If you do, Voidcaster deals X damage to target creature where X is equal to the converted mana cost of the discarded card.
{b}{b}, {t}: Exile Voidcaster. Then, choose one:
- Return Voidcaster to the battlefield at the beginning of your next upkeep.
- Return target card from your graveyard to your hand.