Activate Altar of Dementia by sacrificing Golgari Thug.
When Golgari Thug dies, it triggers, putting itself from your graveyard onto the top of your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Golgari Thug's power, ultimately milling Golgari Thug.
Colossal Grave-Reaver's second ability triggers, putting Golgari Thug from your graveyard onto the battlefield.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Colossal Grave-Reaver

Altar of Dementia

Golgari Thug

Activate Scion of the Ur-Dragon twice by paying {4}.
Resolve the first ability, searching your library for Colossal Grave-Reaver and putting it into your graveyard, and then causing Scion of the Ur-Dragon to become a copy of Colossal Grave-Reaver until end of turn.
Resolve the second ability, searching your library for Bladewing and putting it into your graveyard, and then causing Scion of the Ur-Dragon to become a copy of Bladewing until end of turn.
Because Scion of the Ur-Dragon was a copy of Colossal Grave-Reaver when Bladewing was put into your graveyard, it will trigger, returning Bladewing from your graveyard to the battlefield.
Put Bladewing into your graveyard due to the legend rule.
Bladewing triggers, returning itself from your graveyard to the battlefield.
Repeat from step 5.

Scion of the Ur-Dragon

Bladewing the Risen

Activate Altar of Dementia by sacrificing God-Eternal Bontu.
When God-Eternal Bontu dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to God-Eternal Bontu's power, ultimately milling God-Eternal Bontu.
Colossal Grave-Reaver's second ability triggers, putting God-Eternal Bontu from your graveyard onto the battlefield.
Repeat.

Infinite self-mill

God-Eternal Bontu

Activate Altar of Dementia by sacrificing another nontoken creature with power 1 or greater.
When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to the creature's power, ultimately milling the creature.
Colossal Grave-Reaver's second ability triggers, putting the creature from your graveyard onto the battlefield.
Repeat.

Mortuary

Activate Altar of Dementia by sacrificing God-Eternal Rhonas.
When God-Eternal Rhonas dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to God-Eternal Rhonas's power, ultimately milling God-Eternal Rhonas.
Colossal Grave-Reaver's second ability triggers, putting God-Eternal Rhonas from your graveyard onto the battlefield.
Repeat.

Infinitely powerful creatures you control until end of turn

God-Eternal Rhonas

Activate Altar of Dementia by sacrificing Ilharg.
When Ilharg dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Ilharg's power, ultimately milling Ilharg.
Colossal Grave-Reaver's second ability triggers, putting Ilharg from your graveyard onto the battlefield.
Repeat.

Ilharg, the Raze-Boar

Activate Altar of Dementia by sacrificing God-Eternal Kefnet.
When God-Eternal Kefnet dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to God-Eternal Kefnet's power, ultimately milling God-Eternal Kefnet.
Colossal Grave-Reaver's second ability triggers, putting God-Eternal Kefnet from your graveyard onto the battlefield.
Repeat.

God-Eternal Kefnet

Activate Altar of Dementia by sacrificing God-Eternal Oketra.
When God-Eternal Oketra dies, it triggers, putting itself into your library third from the top.
Resolve the Altar of Dementia ability, causing you to mill cards equal to God-Eternal Oketra's power, ultimately milling God-Eternal Oketra.
Colossal Grave-Reaver's second ability triggers, putting God-Eternal Oketra from your graveyard onto the battlefield.
Repeat.

God-Eternal Oketra

Activate Altar of Dementia by sacrificing Dark Revenant.
When Dark Revenant dies, it triggers, putting itself from your graveyard onto the top of your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Dark Revenant's power, ultimately milling Dark Revenant.
Colossal Grave-Reaver's second ability triggers, putting Dark Revenant from your graveyard onto the battlefield.
Repeat.

Dark Revenant

Activate Altar of Dementia by sacrificing Arashin Sovereign.
When Arashin Sovereign dies, it triggers, putting itself from your graveyard onto the top of your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Arashin Sovereign's power, ultimately milling Arashin Sovereign.
Colossal Grave-Reaver's second ability triggers, putting Arashin Sovereign from your graveyard onto the battlefield.
Repeat.

Arashin Sovereign

Activate Altar of Dementia by sacrificing Avenging Angel.
When Avenging Angel dies, it triggers, putting itself from your graveyard onto the top of your library.
Resolve the Altar of Dementia ability, causing you to mill cards equal to Avenging Angel's power, ultimately milling Avenging Angel.
Colossal Grave-Reaver's second ability triggers, putting Avenging Angel from your graveyard onto the battlefield.
Repeat.

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