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FlashFlashYou may cast this any time you could cast an instant.
When this creature enters, choose target player. You create a tapped Powerstone tokenPowerstone tokenIt's an artifact with "
: Add 
. This mana can't be spent to cast a nonartifact spell." for each nonland card in that player's graveyard that was put there from the battlefield this turn. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
