The Mouth of Sauron

When The Mouth of Sauron enters the battlefield,
target player mills three cards. Then amass Orcs X,
where X is the number of instant and sorcery cards
in that player's graveyard.
"The rider was robed all in black, and black was
his lofty helm, yet this was no Ringwraith
but a living man. The Lieutenant of the Tower of
Barad-dur he was, and his name is remembered
in no tale, for he himself had forgotten it,
and he said: I am the Mouth of Sauron."