
Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand.
FlashbackFlashbackYou may cast this card from your graveyard for its flashback cost. Then exile it. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
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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.