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Karn's power and toughness are each equal to 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. among artifacts you control.
At the beginning of your upkeep, add 
for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.
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.
