Cheapest priced copy (Foundations Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Tangleweave Armor 
Artifact — Equipment · Rare · Foundations Commander · #234
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}
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Commander | 234 | Rare | $0.49 | — |
| Phyrexia: All Will Be One Commander | 26 | Rare | $0.49 | $0.79 |
| Phyrexia: All Will Be One Commander | 36 | Rare | $0.49 | $0.79Out of stock |
5 rulings from Wizards of the Coast
- 4 February 2023Like other Equipment, each Equipment with living weapon has an equip cost. You can pay this cost to attach an Equipment to another creature you control. Once the Germ token is no longer equipped, it will be put into your graveyard and subsequently cease to exist, unless another effect raises its toughness above 0.
- 4 February 2023If the Germ token is destroyed, the Equipment remains on the battlefield as with any other Equipment.
- 4 February 2023If the living weapon trigger causes two Germs to be created (due to an effect such as that of Doubling Season), the Equipment becomes attached to one of them. The other will be put into your graveyard and subsequently cease to exist, unless another effect raises its toughness above 0.
- 4 February 2023The Germ token enters the battlefield as a 0/0 creature and the Equipment becomes attached to it before state-based actions would cause the token to die. Abilities that trigger as the token enters the battlefield see that a 0/0 creature entered the battlefield.
- 4 February 2023It doesn't matter where your commander is (or commanders are, if you have more than one because of the partner ability or similar). The bonus will be calculated using your commander's current characteristics. (Mana value typically doesn't change, but your commander may become a copy of something else.)