+1Look at the top five cards of target player’s library, you may exile one of those cards and put the rest on the bottom of that player's library in any order.
-2Search your library for a card, then shuffle your library and put that card on top of it. You lose 2 life.
-7Each player exiles all creature cards from his or her graveyard, then sacrifices all creatures he or she controls, then puts all creature cards he or she exiled this way onto the battlefield.
I don't think R&D would like a planeswalker whose +1 lets you search an entire library (and make it need shuffling) every turn. You could perhaps go with something like
> Look at the top [five?] cards of target player's library. Exile one of them and put the rest back in a random order.
changed +1 to look at 5, exile 1 and rest on bottom