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At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the greatest 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. takes an extra turn after this one. If two or more players' cards are tied for greatest, the tied players repeat this process until the tie is broken.
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.
