Nalfeshnee is a rare Creature — Beast Demon card from Alchemy Horizons: Baldur's Gate (HBG), collector number 186.
Flying Whenever you cast a spell from exile, copy it. You may choose new targets for the copy. If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.)