Rek'sai, the void burrower

[LEVEL 2], Trample, haste, lurk
Whenever Rek'sai attacks, you get a lurk counter.
When Rek'sai levels up, look at the top 15
card of your library. you may reveal up to 3
cards with lurk from among them and put them
into your hand. put the rest on the bottom of
your library in any order.