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When The Motherlode enters, choose target opponent. You get an amount of 
(energy counters) equal to the number of nonbasic lands that player controls.
Whenever The Motherlode attacks, you may pay . When you do, destroy target nonbasic land defending player controls, and creatures that player controls without flying can't block this turn.
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.
