Activate Altar of Dementia by sacrificing Priest of Gix, causing target player to mill cards equal to Priest of Gix's power.
Activate Priest of Gix's unearth ability by paying {2}{B}, returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
Priest of Gix enters the battlefield, adding {B}{B}{B}.
Activate Altar of Dementia by sacrificing Priest of Gix.
Both Priest of Gix's undying ability and Void Maw attempt to exile Priest of Gix when it would be put into your graveyard.
Choose to apply the Void Maw replacement effect, exiling Priest of Gix.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Gix's power.
Activate Void Maw by putting Priest of Gix from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
Repeat from step 2.

Infinite creature ETB

Infinite creature LTB

Infinitely large creature until end of turn

Infinite mill

Infinite creature sacrifice triggers

Infinite self-mill

Sedris, the Traitor King

Void Maw

Altar of Dementia

Priest of Gix

Activate Altar of Dementia by sacrificing Witch Engine, causing target player to mill cards equal to Witch Engine's power.
Activate Witch Engine's unearth ability by paying {2}{B}, returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
Activate Witch Engine by tapping it.
Holding priority, activate Altar of Dementia by sacrificing Witch Engine.
Both Witch Engine's undying ability and Void Maw attempt to exile Witch Engine when it would be put into your graveyard.
Choose to apply the Void Maw replacement effect, exiling Witch Engine.
Resolve the Witch Engine ability from step 3, adding {B}{B}{B}{B}.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to Witch Engine's power.
Activate Void Maw by putting Witch Engine from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
Repeat from step 2.

Infinite black mana

Witch Engine

Activate Ashnod's Altar by sacrificing Magus of the Coffers, adding {C}{C}.
Activate Magus of the Coffers' unearth ability by paying {2}{B}, returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
Activate Magus of the Coffers by paying {2} and tapping it, adding at least six {B}.
Activate Ashnod's Altar by sacrificing Magus of the Coffers, adding {C}{C}.
Both Magus of the Coffers's undying ability and Void Maw attempt to exile Magus of the Coffers when it would be put into your graveyard.
Choose to apply the Void Maw replacement effect, exiling Magus of the Coffers.
Activate Void Maw by putting Magus of the Coffers from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
Repeat from step 2.

Ashnod's Altar

Magus of the Coffers

Activate Phyrexian Altar by sacrificing Palladium Myr, adding {B}.
Activate Palladium Myr's unearth ability by paying {2}{B}, returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
Activate Palladium Myr by tapping it, adding {C}{C}.
Activate Phyrexian Altar by sacrificing Palladium Myr, adding {B}.
Both Palladium Myr's undying ability and Void Maw attempt to exile Palladium Myr when it would be put into your graveyard.
Choose to apply the Void Maw replacement effect, exiling Palladium Myr.
Activate Void Maw by putting Palladium Myr from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
Repeat from step 2.

Phyrexian Altar

Palladium Myr

Combos with "Sedris, the Traitor King"