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, Sacrifice an artifact: Add an amount of equal to the sacrificed artifact'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.. Spend this mana only to cast artifact spells or activate abilities of artifacts.
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.
