Worldslayer is a rare Artifact — Equipment card from Mirrodin (MRD), collector number 276. Current market price: $4.58 (foil $31.69), 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.)