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Power-upPower-upActivate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn. — 
: Put a +1/+1 counter on Hercules. He gains vigilance, indestructible, and haste until end of turn. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)
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.
