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At the beginning of your end step, if you didn't activate a loyalty ability of a planeswalker this turn, you lose 2 life.
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: For each planeswalker you control, you may activate one of its loyalty abilities once this turn as though none of its loyalty abilities have been activated 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.
