Tinybones, Trinket Thief is a mythic Legendary Creature — Skeleton Rogue card from Secret Lair Drop (SLD), collector number 1407. Current market price: $25.29 (foil $33.03), TCGplayer market prices via Scryfall.
At the beginning of each end step, if an opponent discarded a card this turn, you draw a card and you lose 1 life. {4}{B}{B}: Each opponent with no cards in hand loses 10 life.