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Okay, but it still could do with a little rewording.
- return the cards unshuffled to their original location (shuffle / don't shuffle)
If that card said "you may capture a hero and draw a card"... then "not drawing" would be an option, even though it is nothing.
I would argue that not shuffling IS an ability. It is an ability that allows you to break the standard rules of the game, just play playing the next enhancement lets you bypass initiative.