Arena of Hunters

{t}: Add {c}.
{2}{b/r}{w/u}, {t}: Arena of Hunters deals 2 damage to
target creature, then tap that creature. You gain
2 life.
{3}{b/r}{w/u}, {t}, sacrifice Arena of Hunters, discard X
cards: Destroy X target creatures. They can't be regenerated. For each creature destroyed this way,
it's controller loses 1 life.