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,
: Tap target creature and put a +1/+1 counter on it. Until end of turn, that creature gains "
: DoubleDoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. the number of +1/+1 counters on this creature."
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.