At the beginning of each upkeep, Tombostone Stairwell's first ability triggers, causing each player to create a 2/2 Zombie creature token for each creature card in their graveyard.
At the beginning of each end step, Tombstone Stairwell's second ability triggers, destroying all tokens created by it.
When the token(s) die, Blood Artist triggers that many times, causing an opponent to lose that much life and you to gain that much life.
Repeat during each turn.

Near-infinite lifeloss

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite lifegain

Near-infinite lifegain triggers

Tombstone Stairwell

Blood Artist

Activate Tetzimoc by paying {B} and revealing it from your hand, targeting a creature an opponent controls.
Horobi triggers, destroying that creature.
The creature dies, triggering Revel in Riches' first ability, creating a Treasure token.
Activate the Treasure token by tapping and sacrificing it, adding {B}.
Repeat.

Destroy any number of creatures opponents control during each of your turns

Tetzimoc, Primal Death

Horobi, Death's Wail

Revel in Riches

Activate Tetzimoc by paying 2 life and revealing it from your hand, targeting a creature an opponent controls.
Horobi triggers, destroying that creature.
The Tetzimoc ability fails to resolve  due to no longer having a legal target.
The creature dies, triggering Dross Harvester, causing you to gain two life.
Repeat.

Destroy any number of target creatures during each of your turns

K'rrik, Son of Yawgmoth

Dross Harvester

Declare Baldin as an attacker.
Baldin triggers, targeting up to 100 creatures.
Horobi triggers for each creature targeted this way, destroying them.
You may repeat this during each of your turns.

Destroy up to 100 creatures during each of your turns

Baldin, Century Herdmaster

Activate Deathbringer Thoctar by removing a +1/+1 counter from it, targeting any creature an opponent controls.
Horobi triggers, destroying the targeted creature.
When the creature dies, Deathbringer Thoctar triggers, putting a +1/+1 counter on itself.
Repeat as desired.
You may also repeat this combo whenever a creature enters the battlefield under an opponent's control.

Destroy all creatures opponents control

Destroy each creature that enters the battlefield under an opponent's control

Lock

Deathbringer Thoctar

Activate Soltari Guerrillas by paying {0}, targeting any creature.
Horobi triggers, destroying that creature.
Repeat.
You may also repeat this loop whenever a creature enters the battlefield.

Destroy any number of creatures

Soltari Guerrillas

Cast the instant or sorcery by paying its mana cost.
Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery.
Resolve the copy of the instant or sorcery, untapping Stella Lee.
Repeat from step 2.

Infinite copies of one instant or sorcery

Infinite magecraft triggers

Instant or Sorcery that untaps a Creature

Stella Lee, Wild Card

Cast Moritte either from your hand or from the command zone by paying {2}{G}{U}{U} plus commander tax if applicable. Choose to have it enter as a copy of the persist creature that is still legendary.
Put Moritte into your graveyard due to the legend rule. When it dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to its ability. Choose to have it enter as a copy of the persist creature that is still legendary.
Repeat step 2.

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