Restless Bones is a common Creature — Skeleton card from Guildpact (GPT), collector number 58. Current market price: $0.10 (foil $0.39), TCGplayer market prices via Scryfall.
{3}{B}, {T}: Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.) {1}{B}: Regenerate this creature.