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Shuffle your library, then exile the top four cards. You may cast any number of spells with 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. 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step.
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.
