Nicol Bolas, the Elked

: Whenever a creature enters the battlefield under your control, you may have it become a 3/3 green elk and lose all abilities. It retains its CMC.
-3: You may sacrifice a creature. If you do, search your library for a creature card with the same CMC, put it onto the battlefield, and shuffle.
-5: Scry X, where X is the number of creatures in your graveyard.