Mountain of Smiling Bodies

Delve, Escape 7 - {9}{b}{g} (Exile 7 cards from Grave)
{3}{g}{b}: Monstrosity 7.
Trample, devour 2
Sacrifice another creature: Regenerate Mountain of Smiling Bodies.
Mountain of Smiling Bodies escapes with an additional +1/+1 counter on it for each creature you own in exile.
+1/+1 counters remain on Mountain of Smiling Bodies as it moves to any zone other than a player's hand or library.
When Mountain of Smiling Bodies becomes Monstrous, mill 20 cards.