
Rulebreaker — A deck with this commander can have creature cards 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. 7 or greater of any color identitycolor identityA card's colours plus the colours of every mana symbol in its rules text. In Commander, every card in the deck must fit within the commander's colour identity. and any basic land cards.
Whenever a creature you control 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. 7 or greater attacks, doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. its power and toughness until end of turn.
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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.