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
Legendary Scenes Come to Life: A combined picture worth a thousand words
The List The decklist that we settled on had some cards we were unsure about heading into the event, but hindsight was fortunate this time around
This is a particularly on-theme addition to Universes Beyond Spongebob decks, for example
If the exerted creature is no longer on the battlefield or the Equipment can't legally be attached to that creature, that Equipment will enter the battlefield unattached
Once done, we are left with an expected value of 3.131, and multiplying by 13% gets us to 0.407