Carlos, Bounty Hunter

0: Sacrifice a creature. Put X loyalty counters on Carlos, Bounty Hunter, being X the mana cost of sacrificed creature.
-1: Exile Carlos, Bounty Hunter and one target creature. destroy that creature. At the beginning of your next turn return carlos to the battlefield.
-X: Carlos, Bounty Hunter deals X damage to target opponent. Add half X mana rounded down to your mana pool.