Nettlecyst is a rare Artifact — Equipment card from March of the Machine Commander (MOC), collector number 367. Current market price: $3.48, TCGplayer market prices via Scryfall.
Living weapon (When this Equipment enters, create a 0/0 black Phyrexian Germ creature token, then attach this to it.) Equipped creature gets +1/+1 for each artifact and/or enchantment you control. Equip {2}