Draw a card.
Niv-Mizzet's first ability triggers, dealing 1 damage to any opponent.
Niv-Mizzet triggers, causing you to draw a card.
Repeat from step 2.

Infinite card draw

Infinite draw triggers

Near-infinite damage

Niv-Mizzet, Parun

Snake Umbra

Draw a card.
Niv-Mizzet triggers, dealing 1 damage to any opponent.
Niv-Mizzet triggers, causing you to draw a card.
Repeat from step 2.

Niv-Mizzet, the Firemind

Draw a card.
The Locust God triggers, creating a 1/1 Insect creature token with flying and haste.
The Insect enters the battlefield, triggering Witty Roastmaster, dealing 1 damage to each opponent.
Snake Umbra triggers, causing you to draw a card.
Repeat from step 2.

Near-infinite creature tokens with haste

Near-infinite ETB

The Locust God

Witty Roastmaster

During the next cleanup step, discard cards down to your maximum hand size.
Magmakin Artillerist triggers, dealing 1 damage to each opponent for each card discarded this way.
Snake Umbra triggers, causing you to draw a card.
As you are still in the cleanup step, once the stack is empty and priority has been passed by all players, you will discard down to your maximum hand size again.
Repeat from step 2.

Infinite self-discard triggers

Infinite rummaging

Magmakin Artillerist

Activate Ghostly Pilferer by discarding a card.
Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent.
Snake Umbra triggers for each opponent dealt damage.
Resolve one trigger, causing you to draw a card.
Holding priority, repeat.
Repeat.

Near-infinite self-discard triggers

Glint-Horn Buccaneer

Ghostly Pilferer

Activate Patchwork Gnomes by discarding a card.
Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent.
Snake Umbra triggers for each opponent dealt damage.
Resolve one trigger, causing you to draw a card.
Holding priority, repeat.
Repeat.

Patchwork Gnomes

Activate Murderer's Axe's equip ability by discarding a card, targeting any creature.
Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent.
Snake Umbra triggers for each opponent dealt damage.
Resolve one trigger, causing you to draw a card.
Holding priority, repeat.
Repeat.

Murderer's Axe

Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to an opponent.
Walking Ballista triggers, causing you to draw a card.
Lyla triggers, putting a +1/+1 counter on Walking Ballista.
Repeat.

Lyla, Holographic Assistant

Walking Ballista

Activate Cephalid Inkshrouder by discarding a card.
Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent.
Snake Umbra triggers for each opponent dealt damage.
Resolve one trigger, causing you to draw a card.
Holding priority, repeat.
Repeat.

Cephalid Inkshrouder

Activate Aquamoeba by discarding a card.
Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent.
Snake Umbra triggers for each opponent dealt damage.
Resolve one trigger, causing you to draw a card.
Holding priority, repeat.
Repeat.

Combos with "Snake Umbra"