Phenax, God of Deception + Sewer Nemesis + Fleet Swallower

Phenax, God of Deception

Sewer Nemesis

Fleet Swallower

How it works

1. Declare Fleet Swallower as an attacker, triggering it, causing the player named by Sewer Nemesis to mill half their library, rounded up.
2. Activate Sewer Nemesis by tapping it, causing the player to mill cards equal to the cards in their graveyard, milling the remainder of their library.