Vortex Arena

{3}, {t}: Exile a creature you control and a creature
you don't control, then return a creature exiled
by Vortex Arena to the battlefield with no loser counters on it to it's owner's control at random,
then put a loser counter on a creature card exiled
by Vortex Arena with no loser counters on it still
in exile.
"It's simple! Just step in, and maybe come back out!"