Cheapest priced copy (The Brothers' War Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Bronze Guardian 
Artifact Creature — Golem · */5 · Rare · The Brothers' War Commander · #70
Double strike
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Other artifacts you control have ward {2}.
Bronze Guardian's power is equal to the number of artifacts you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.79 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 70 | Rare | $0.79 | — |
| Commander 2021 | 13 | Rare | $1.49 | — |
| Commander 2021 | 340 | Rare | $4.49 | — |
| Final Fantasy Commander | 234 | Rare | $0.79 | $2.49 |
3 rulings from Wizards of the Coast
- 16 April 2021If a player casts a spell that targets multiple permanents their opponent controls with ward, each of those ward abilities will trigger. If that player doesn't pay for all of them, the spell will be countered.
- 16 April 2021Once a ward ability has triggered, it doesn't matter if the artifact loses ward (most likely because Bronze Guardian leaves the battlefield in response) before the ability resolves. The controller of the spell or ability will still have to pay {2} or the spell or ability will be countered.
- 16 April 2021The ability that defines Bronze Guardian's power applies in all zones, not only while it is on the battlefield.