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Robobrain War Mind's power is equal to the number of cards in your hand.
When this creature enters, you get an amount of 
(energy counters) equal to the number of artifact creatures you control.
Whenever this creature attacks, you may pay . If you do, draw a card.
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.
