Chainer, Nightmare Adept

If you somehow activate Chainer's first ability more than once during a turn (perhaps because Chainer left the battlefield and returned), you can cast a creature card for each ability's permission. Similarly, if another effect allows you to cast a creature card from your graveyard, you may use that permission and later use Chainer's permission to cast another creature card.

You don't choose a creature card to cast while activating or resolving Chainer's first ability. The ability creates a permission for you to cast a creature card from your graveyard later in the turn.

Chainer's last ability triggers if Chainer enters the battlefield without being cast from your hand.