Deathless Prison Guard

Arbiter -- {w}{u}, {t}: Choose one. If you have
exactly four cards in your hand, choose two
instead -
- Detain target creature. (Until your next turn, that creature can't attack or block and its activated
abilities can't be activated.)
- Draw a card for each detained creature.
{2}, Discard two cards: Return Deathless Prison
Guard from your graveyard to your hand.