Ozox, the Clattering King is a uncommon Legendary Creature — Skeleton Noble card from Foundations Jumpstart (J25), collector number 44. Current market price: $0.30, TCGplayer market prices via Scryfall.
Ozox can't block. When Ozox dies, create Jumblebones, a legendary 2/1 black Skeleton creature token with "Jumblebones can't block" and "When Jumblebones leaves the battlefield, return target card named Ozox, the Clattering King from your graveyard to your hand."