Cast Glasspool Mimic by paying its mana cost. Choose to have it enter the battlefield as a copy of Ao.
Put Glasspool Mimic into your graveyard due to the legend rule.
When Glasspool Mimic dies, it and Mortuary trigger.
Resolve the Mortuary trigger, putting Glasspool Mimic from your graveyard onto the top of your library.
Resolve the Glasspool Mimic trigger, causing you to look at the top seven cards of your library and put Glasspool Mimic onto the battlefield as a copy of Ao.
Repeat from step 2.

Infinite LTB

Infinite ETB

Infinite death triggers

Ao, the Dawn Sky

Mortuary

Glasspool Mimic // Glasspool Shore

Activate Phyrexian Altar by sacrificing Ao, adding one mana of any color.
Ao dies, triggering itself and Nim Deathmantle.
Resolve the Ao trigger, putting four +1/+1 counters on each creature and Vehicle you control.
Activate Workhorse by removing four +1/+1 counters from it, adding {C}{C}{C}{C}.
Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Ao from your graveyard to the battlefield, and then attach Nim Deathmantle to it.
Repeat.

Infinite +1/+1 counters on all Vehicles you control

Infinite colored mana

Infinite colorless mana

Infinite sacrifice triggers

Put a selection of permanent cards from your library onto the battlefield

Infinite +1/+1 counters on most creatures you control

Workhorse

Nim Deathmantle

Phyrexian Altar

Doubling Season

Vorinclex, Monstrous Raider

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