Envoy of Ulamog

When Envoy of Ulamog enters the battlfield, look at the top 5 cards of your library. You may reveal a creature card from among them and put it into your hand, then
put the rest on the bottom of your library.
As long as you control an Ulamog creature, Envoy of Ulamog gets +2/+1, Trample and Deathtouch