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At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.
At the beginning of your end step, if you didn't play a card from exile this turn, create a tapped Powerstone tokenPowerstone tokenIt's an artifact with "
: Add 
. This mana can't be spent to cast a nonartifact spell.". (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.
