Up for sale is the flaying Skeletonize, an uncommon card from the Shards of Alara expansion of Magic: the Gathering. This is the Foil, black-bordered, English version.
Skeletonize: Instant; Skeletonize deals 3 damage to target Creature; when a Creature dealt damage this way is put into a graveyard this turn, put a 1/1 Black Skeleton Creature token into play with "spend B to Regenerate this Creature."; casting cost 4R.
These cards are all in at least Very Fine condition, with most being in unplayed, Mint/Near Mint condition.
