Fireshrieker is a uncommon Artifact — Equipment card from Conspiracy (CNS), collector number 199. Current market price: $0.23 (foil $3.93), TCGplayer market prices via Scryfall.
Equipped creature has double strike. (It deals both first-strike and regular combat damage.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)