Chainer, Nightmare Adept is a rare Legendary Creature — Human Minion card from The List (PLST), collector number MH2-289. Current market price: $0.76, TCGplayer market prices via Scryfall.
Discard a card: You may cast a creature spell from your graveyard this turn. Activate only once each turn. Whenever a nontoken creature you control enters, if you didn't cast it from your hand, it gains haste until your next turn.