Worldslayer is a rare Artifact — Equipment card from Magic 2012 (M12), collector number 222. Current market price: $4.14 (foil $23.30), TCGplayer market prices via Scryfall.
Whenever equipped creature deals combat damage to a player, destroy all permanents other than this Equipment. Equip {5} ({5}: Attach to target creature you control. Equip only as a sorcery.)