Skeletonize is a common Instant card from Masters 25 (A25), collector number 149. Current market price: $0.06 (foil $0.27), TCGplayer market prices via Scryfall.
Skeletonize deals 3 damage to target creature. When a creature dealt damage this way dies this turn, create a 1/1 black Skeleton creature token with "{B}: Regenerate this token."