Cheapest priced copy (The Brothers' War Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Terisiare's Devastation 
Sorcery · Rare · The Brothers' War Commander · #56
You lose X life and create X tapped Powerstone tokens. Then all creatures get -1/-1 until end of turn for each artifact you control. (The tokens are artifacts with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 9 | Rare | $0.49 | — |
| The Brothers' War Commander | 56 | Rare | $0.49 | — |
3 rulings from Wizards of the Coast
- 14 October 2022Although all the cards in The Brothers’ War that create Powerstone tokens create a tapped Powerstone token, entering the battlefield tapped isn’t part of the token’s definition. Notably, if you create a token that is a copy of a Powerstone token, the token copy won’t enter the battlefield tapped.
- 14 October 2022Powerstone tokens are a kind of predefined token. Each one has the artifact subtype “Powerstone” and the ability “{T}: Add {C}. This mana can’t be spent to cast a nonartifact spell.”
- 14 October 2022You can use the {C} added by a Powerstone token on anything that isn’t a nonartifact spell. This includes paying costs to activate abilities of both artifact and nonartifact permanents, paying ward costs, and so on.