Nettlecyst is a rare Artifact — Equipment card from Foundations Commander (FDC), collector number 275. Current market price: $0.86, 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}