1 printing listed in our catalog, from newest to oldest.
The Brothers' WarBRO · No. 1322022-11-18
Card text
Sorcery
Excavation Explosion deals 3 damage to any target. Create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
Urza's engineers could take weeks to dig out a powerstone. The goblins weren't so painstaking.
Powerstone 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."
2022-10-14 · Wizards of the Coast
Although 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.
2022-10-14 · Wizards of the Coast
You 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.
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: Add 
. This mana can't be spent to cast a nonartifact spell.")
Dungeon Comics & Cards · Foil
