Declare Jumbo Cactuar as an attacker, triggering its ability, giving it +9999/+0 until end of turn.
Activate Altar of Dementia by sacrificing Jumbo Cactuar, causing a player to mill their library.

Infinite self-mill

Infinite mill for target opponent

Altar of Dementia

Jumbo Cactuar

Cast Young Necromancer by paying {4}{B}.
Young Necromancer enters the battlefield, triggering its ability.
Holding priority, activate Altar of Dementia by sacrificing Young Necromancer, causing you to mill two cards.
Resolve the Young Necromancer trigger, exiling two cards from your graveyard except Young Necromancer, and returning Young Necromancer from your graveyard to the battlefield.
Repeat from step 2.

Near-infinite death triggers

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite creature sacrifice triggers

Young Necromancer

Cast Body of Research by paying {G}{G}{G}{U}{U}{U}, creating a 0/0 Fractal creature token, and then putting a number of +1/+1 counters on it equal to your deck size.
Activate Altar of Dementia by sacrificing the Fractal, causing target player to mill cards equal to the Fractal's power.

Near-infinite mill for target opponent

Body of Research

Cast Doppelgang by paying {15}{G}{U}, creating five token copies of Possessed Skaab and of the four mana-producing permanents.
When the Possessed Skaab tokens enter the battlefield, they trigger, returning Doppelgang and up to four other creature, instant or sorcery cards from your graveyard to your hand.
Activate seventeen of the mana-producing permanent tokens by tapping them, adding at least {15}{G}{U}.
Repeat.
Once you have infinite tokens and mana, you may instead target any other permanents using Doppelgang.

Infinite creature ETB

Infinite storm count

Infinite creature tokens

Infinite magecraft triggers

Infinite landfall triggers

Infinite copies of all permanents

Infinite mana permanents you control can produce

Return all instant and sorcery cards from your graveyard to your hand

Return all creature cards from your graveyard to your hand

Doppelgang

Possessed Skaab

Cast Kroxa and Kunoros either from your hand or from the command zone by paying {3}{R}{W}{B} and commander tax, if applicable.
When Kroxa and Kunoros enters the battlefield, it triggers.
Holding priority, activate Altar of Dementia by sacrificing Kroxa and Kunoros, causing you to mill cards equal to Kroxa and Kunoros' power.
Resolve the Kroxa and Kunoros trigger, causing you to exile five other cards from your graveyard and return Kroxa and Kunoros from your graveyard to the battlefield.
Repeat from step 2.

Exile your library

Kroxa and Kunoros

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