Artefatto
Ogniqualvolta la Raffineria di Scorie o un altro artefatto non pedina che controlli viene messo in un cimitero dal campo di battaglia o viene messo in esilio dal campo di battaglia, crea una pedina Pietra del Potere TAPpata. (È un artefatto con "

: Aggiungi

. Questo mana non può essere speso per lanciare una magia non artefatto".)
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.
Powerstone tokens are a kind of predefined token. Each one has the artifact subtype "Powerstone" and the ability "
: Add
. This mana can't be spent to cast a nonartifact spell."
If Slagstone Refinery is put into a graveyard from the battlefield or exiled from the battlefield at the same time that one or more other nontoken artifacts controlled by the same player are put into a graveyard from the battlefield and/or exiled from the battlefield, its triggered ability will trigger once for each of them plus once for itself.
You can use the
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.