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Each player sacrifices the creature they control 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. unless they pay that creature's mana cost. If two or more creatures a player controls are tied for greatest, that player chooses one.
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.
