Shimmering Depths

{3}: Look at the top six cards and exile two
of them face-down. Chose one of the cards
exiled by Shimmering Depths at random
and put it into your hand. Activate this
ability only once in your turn. (If the chosen
card is an event card, it comes into play
instead.)
When this card leaves the battlefield,
shuffle all cards exiled by it into the library.