Edrukov, Forest Abomination

Deathtouch
Whenever a creature you control dies, you may look at the top 5 cards of your library. Put 3 into your graveyard and the rest on top in any order.
At the beginning of your upkeep, if there are 20
or more cards in your graveyard, transform Edrukov.
A terror stalks the Ulvenwald...