Tangleweave Armor (ONC) from Phyrexia: All Will Be One Commander, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Johann Bodin
• Card Text:
  Living weapon (When this Equipment enters the battlefield, 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