Just survive long enough to mill them out. Demon tribal-ish, Lhurgoyf tribal-ish. Doesn't win often, but when it does, it goes big.

Grixis : Blue, Black, Red

When Lord Xander enters, target opponent discards half the cards in their hand, rounded down.

Whenever Lord Xander attacks, defending player mills half their library, rounded down.

When Lord Xander dies, target opponent sacrifices half the nonland permanents they control of their choice, rounded down.

Commander
Lord Xander, the Collector

Artifacts
Altar of the Goyf
Arcane Signet
Mindcrank
Sol Ring
The Water Crystal

Creatures
Academy Elite
The Ancient One
Avatar of Woe
Bruvac the Grandiloquent
Consuming Aberration
Evil Twin
Fleet Swallower
Goblin Electromancer
Kess, Dissident Mage
Lazav, Dimir Mastermind
Magnivore
Manic Scribe
Mirko Vosk, Mind Drinker
Mocking Sprite
Mortivore
Necrogoyf
Nighthawk Scavenger
Nightscape Familiar
Phenax, God of Deception
Plague Drone
Riddlekeeper
Ruin Crab
Szadek, Lord of Secrets
Terisian Mindbreaker
Thief of Sanity
Wight of Precinct Six
Zagras, Thief of Heartbeats
Zellix, Sanity Flayer

Enchantments
Bloodchief Ascension
Court of Cunning
Curse of the Bloody Tome
Drowned Secrets
Fevered Visions
Fraying Sanity
Memory Erosion
Propaganda
Psychic Corrosion
Teferi's Tutelage

Instants
Bedevil
Counterspell
Dark Ritual
Didn't Say Please
Frantic Search
Visions of Beyond

Sorcery
Diabolic Tutor
Fractured Sanity
Glimpse the Unthinkable
Increasing Confusion
Maddening Cacophony
Mind Funeral
Mind Grind
Mind Sculpt
Psychic Drain
Stream of Thought
Tasha's Hideous Laughter
Tome Scour
Traumatize

Lands
Akoum Refuge
Bloodfell Caves
Bojuka Bog
Command Tower
Dismal Backwater
Island x 7
Jwar Isle Refuge
Maestros Theater
Mountain x 7
Path of Ancestry
Swamp x 7
Swiftwater Cliffs
Temple of Deceit
Temple of Epiphany
Temple of Malice
Thriving Bluff
Thriving Isle
Thriving Moor
Xander's Lounge