Tangleweave Armor is a rare Artifact — Equipment card from Foundations Commander (FDC), collector number 234. Current market price: $0.23, 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 +X/+X, where X is the greatest mana value among your commanders. Equip {4}