Lore Broker does not have summoning sickness.

Activate Lore Broker by tapping it, causing each player to loot.
Xyris' first ability triggers for each card opponents draw this way, creating that many 1/1 Snake creature tokens.
The Snakes enters the battlefield, triggering Intruder Alarm that many times, untapping all creatures.
Repeat.

Cephalid Looter does not have summoning sickness.

Activate Cephalid Looter by tapping it, causing an opponent to loot.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Repeat.

Breath of Fury attached to any other creature you control.
An opponent is unable to block and kill your creatures.

Deal combat damage with Xyris and the creature with Breath of Fury attached.
Xyris and Breath of Fury trigger.
Resolve the Xyris trigger, causing you and the opponent dealt combat damage to draw cards equal to the damage dealt by Xyris.
Xyris triggers for each card the opponent draws, creating that many 1/1 Snake creature tokens.
Resolve the Breath of Fury trigger, sacrificing the enchanted creature, attaching Breath of Fury to a Snake token, untapping all creatures you control and getting an additional combat phase after this one.
Repeat.

Activate Folio of Fancies by paying and taping it, causing each player to draw a card.
Xyris triggers, creating a 1/1 Snake token for each card that opponent drew.
Activate Mind over Matter by discarding a card, untapping Folio of Fancies.
Activate Ashnod's Altar by sacrificing a 1/1 Snake token, adding .
Repeat.

You have a way to give Flumph indestructible.
You have a way to deal damage to Flumph.

Give Flumph indestructible by any method.
Deal damage to Flumph.
Flumph triggers, causing you and target opponent to draw a card.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Pandemonium, dealing 1 damage to Flumph.
Repeat from step 3.

You have a way to give Flumph indestructible.
You have a way to deal damage to Flumph.

Give Flumph indestructible by any method.
Deal damage to Flumph.
Flumph triggers, causing you and target opponent to draw a card.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Warstorm Surge, dealing 1 damage to Flumph.
Repeat from step 3.

Lumengrid Augur does not have summoning sickness.

Activate Lumengrid Augur by paying and tapping it, causing an opponent to loot.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Activate Ashnod's Altar by sacrificing the Snake, adding .
Repeat.

Jace's Archivist and Bloom Tender do not have summoning sickness.
A player has at least one card in their hand.

Activate Bloom Tender by tapping it, adding at least .
Activate Jace's Archivist by paying and tapping it, causing each player to discard their hand and draw cards equal to the greatest number of cards discarded by a single player this way.
Xyris triggers once for each card your opponent draw, and Kozilek triggers if it was discarded.
Resolve the first Xyris trigger, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Activate Bloom Tender by tapping it, adding at least .
Repeat from step 4 for each remaining Xyris trigger.
Resolve the Kozilek trigger from step 3, if applicable, causing you to shuffle your graveyard into your library.
Repeat from step 2.

You have a way to give Flumph indestructible.
You have a way to deal damage to Flumph.

Give Flumph indestructible by any method.
Deal damage to Flumph.
Flumph triggers, causing you and target opponent to draw a card.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
The Snake enters the battlefield, triggering Terror of the Peaks, dealing 1 damage to Flumph.
Repeat from step 3.

You control at least one additional creature, and at least one additional Snake.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating a 1/1 Snake creature token.
When the Snake enters the battlefield, Mana Echoes triggers, adding for each Snake you control.
Repeat.
If you control two or more Snakes when you begin the combo, this combo will net near-infinite colorless mana.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris's first ability triggers, creating a 1/1 Snake and a 1/1 Frog creature token.
Activate Ashnod's Altar by sacrificing the Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris's first ability triggers, creating a 1/1 Snake and a 1/1 Soldier creature token.
Activate Ashnod's Altar by sacrificing the Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris's first ability triggers, creating a 1/1 Snake and a 1/1 Squirrel creature token.
Activate Ashnod's Altar by sacrificing the Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating three 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.
Kaya has at least two loyalty counters on it.

Activate Kaya's second loyalty ability by removing two loyalty counters from it, causing you to double any tokens you create this turn.
Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat from step 2.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.

You control at least one additional creature.
It is your turn.

Activate Thallid Soothsayer by paying and sacrificing another creature, causing you to draw a card.
An opponent's Wedding Ring's second ability triggers, causing them to draw a card.
Xyris' first ability triggers, creating two 1/1 Snake creature tokens.
Activate Ashnod's Altar by sacrificing a Snake, adding .
Repeat.