Ydwen Efreet is a rare Creature — Efreet card from Arabian Nights (ARN), collector number 44. Current market price: $71.19, TCGplayer market prices via Scryfall.
Whenever this creature blocks, flip a coin. If you lose the flip, remove this creature from combat and it can't block this turn. Creatures it was blocking that had become blocked by only this creature this combat become unblocked.