Cast Storm Herd by paying {8}{W}{W}, creating a number of 1/1 Pegasus creature tokens equal to your life total.
Cast Cauldron Haze by paying {1}{W/B}, targeting every creature you control.
Venerated Rotpriest triggers for each creature targeted by Cauldron Haze.
Resolve the first trigger, causing an opponent to get a poison counter.
Repeat step 4 until an opponent loses the game due to having ten poison counters, then repeat for each other opponent.

Each opponent loses the game

Venerated Rotpriest

Storm Herd

Cauldron Haze

Cast Cauldron Haze by paying {1}{W/B}, giving Archaeoamncer and at least one additional creature with base toughness two or greater persist until end of turn.
Activate Phyrexian Altar by sacrificing Mnemonic Wall and the additional creature, adding  {1}{W/B}.
When the creatures die, their persisit abilities trigger, returning themselves from your graveyard to the battlefield with zero -1/-1 counters due to Solemnity.
When Mnemonic Wall enters the battlefield, it triggers, returning Cauldron Haze to your hand from your graveyard.
Repeat.
If you control an additional nontoken creature with base toughness two or greater, you may also sacrifice and return it to get infinite colored mana.

Infinite colored mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite magecraft triggers

Infinite creature sacrifice triggers

Infinite storm count

Solemnity

Phyrexian Altar

Mnemonic Wall

Cast Cauldron Haze by paying {1}{W/B}, giving Archaeoamncer and at least one additional creature with base toughness two or greater persist until end of turn.
Activate Phyrexian Altar by sacrificing Shipwreck Dowser and the additional creature, adding  {1}{W/B}.
When the creatures die, their persisit abilities trigger, returning themselves from your graveyard to the battlefield with zero -1/-1 counters due to Solemnity.
When Shipwreck Dowser enters the battlefield, it triggers, returning Cauldron Haze to your hand from your graveyard.
Repeat.
If you control an additional nontoken creature with base toughness two or greater, you may also sacrifice and return it to get infinite colored mana.

Shipwreck Dowser

Cast Cauldron Haze by paying {1}{W/B}, giving Archaeoamncer and at least one additional creature with base toughness two or greater persist until end of turn.
Activate Phyrexian Altar by sacrificing Salvager of Secrets and the additional creature, adding  {1}{W/B}.
When the creatures die, their persisit abilities trigger, returning themselves from your graveyard to the battlefield with zero -1/-1 counters due to Solemnity.
When Salvager of Secrets enters the battlefield, it triggers, returning Cauldron Haze to your hand from your graveyard.
Repeat.
If you control an additional nontoken creature with base toughness two or greater, you may also sacrifice and return it to get infinite colored mana.

Salvager of Secrets

Cast Cauldron Haze by paying {1}{W/B}, giving Archaeoamncer and at least one additional creature with base toughness two or greater persist until end of turn.
Activate Phyrexian Altar by sacrificing Archaeomancer and the additional creature, adding  {1}{W/B}.
When the creatures die, their persisit abilities trigger, returning themselves from your graveyard to the battlefield with zero -1/-1 counters due to Solemnity.
When Archaeomancer enters the battlefield, it triggers, returning Cauldron Haze to your hand from your graveyard.
Repeat.
If you control an additional nontoken creature with base toughness two or greater, you may also sacrifice and return it to get infinite colored mana.

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