When The Mouth of Sauron enters the battlefield, target player mills (To mill a card, a player puts the top card of their library into their graveyard.) three cards. Then amass Orcs X (Put X +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.), where X is the number of instant and sorcery cards in that player's graveyard.