Phenax, God of Deception stax

Phenax, God of Deception turns every creature into a mill engine: while UB devotion stays high, Phenax is an indestructible 5/5 granting all creatures "T: mill X" equal to their power. The gameplan: slow the board with pillowfort/stax (Propaganda, Silent Arbiter, Cyclonic Rift, counterspells like Counterspell, Drown in the Loch, Thought Collapse) while constant mill fills opponents' graveyards, triggering payoffs like Bruvac the Grandiloquent (doubles mill against opponents), Consuming Aberration, Sewer Nemesis, Nemesis of Reason and Fleet Swallower, which grow huge or deal massive mill. Underworld Dreams, Psychic Corrosion and Sphinx's Tutelage punish every opposing draw, while Bloodchief Ascension converts mill into direct life drain. Syr Konrad, the Grim turns any creature card hitting any graveyard into direct damage to opponents, often becoming the real win condition. Mesmeric Orb, Hedron Crab, Ruin Crab and Altar of the Brood provide constant passive mill independent of Phenax. Scavenger Grounds and Nihil Spellbomb give graveyard hate to protect against reanimator or combo decks, while The Ancient One, Mortivore and Consuming Aberration recoup value from full graveyards. Rhystic Study and mana rocks like Sol Ring accelerate the control plan. Weaknesses: the deck is slow to close games without Konrad or the big mill-creatures online, it's vulnerable to graveyard hate (which can shut down half the plan), and depends on Phenax staying on the battlefield to activate creatures — targeted removal or exile effects stop it cold. The stax elements can also invite crossfire aggression if the board isn't managed carefully with Propaganda/Arbiter.