Silguul, Undercity Infiltrator

Delve
As long as there are at least four lands in your graveyard, Silguul, Undercity Infiltrator has
Shroud, Plainswalk and Mountainwalk.
{b/g}{u/b}{t}, Put the top four cards of your library
into your graveyard.
"So many scoundrels, criminals and low-lifes...
Perfect."