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Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total 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. of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs.
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.
