Activate Aerith Gainsborough by using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target and causing you to gain 1 life due to its lifelink.
Aerith Gainsborough triggers, putting a +1/+1 counter on it.
Repeat.

Infinite damage

Infinite lifegain triggers

Infinite lifegain

Agatha's Soul Cauldron

Walking Ballista

Aerith Gainsborough

Give Shalai and Hallar lifelink, if needed.
Gain life.
Aerith Gainsborough triggers, putting a +1/+1 counter on it.
Shalai and Hallar triggers, dealing damage to an opponent and causing you to gain life.
Repeat from step 3.

Infinite +1/+1 counters on a creature

Card That Gives Lifelink

Shalai and Hallar

Gain life.
Aerith Gainsborough triggers, putting a +1/+1 counter on it
All Will Be One triggers, dealing 1 damage to an opponent.
Bloodthirsty Conqueror triggers, causing you to gain 1 life.
Repeat from step 2.

Infinite lifeloss

All Will Be One

Bloodthirsty Conqueror

Activate Cauldron of Souls by tapping it, giving Derevi and Aerith persist until end of turn.
Activate Spawning Pit by sacrificing Derevi.
When Derevi dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Derevi enters the battlefield, it triggers, untapping Cauldron of Souls.
Activate Spawning Pit by sacrificing Aerith.
When Aerith dies, it triggers twice.
Resolve Aerith's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the second Aerith trigger, putting a +1/+1 counter on each legendary creature you control, thus removing the -1/-1 counters from Aerith and Derevi.
Resolve the Spawning Pit abilities from steps 2 and 5.
Repeat.

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