Phenax, God of Deception | Sewer Nemesis | Terisian Mindbreaker

Cards

All permanents on the battlefield (
Sewer Nemesis without summoning sickness and with an opponent chosen and
Terisian Mindbreaker without summoning sickness).

Declare
Terisian Mindbreaker as an attacker attacking the opponent named by
Sewer Nemesis.
Terisian Mindbreaker triggers, causing the opponent to mill half their library, rounded up.
Activate
Sewer Nemesis by tapping it, causing the opponent to mill cards equal to the cards in their graveyard, milling the remainder of their library.