Possible usages:
Defensive:
* Early game: Bad hand draw: Play the useful cards (like lands), then shuffle the rest
* Late game land removal: Instead of playing lands when you have to much quanta anyway, hold onto them and shuffle them.
Offensive:
* Combine with precognition to get rid of some annoying spells.
Otherwise just play the card with an empty hand to get rid of it and draw a new card.