Sylvok Battle-Chair is a uncommon Artifact — Equipment card from Phyrexia: All Will Be One (ONE), collector number 184. Current market price: $0.16 (foil $0.10), TCGplayer market prices via Scryfall.
For Mirrodin! (When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +4/+4 and has trample. Equip {5}{G}{G}