Fireshrieker is a uncommon Artifact — Equipment card from Mirrodin (MRD), collector number 171. Current market price: $0.27 (foil $7.47), 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.)