Activate Ancient Den by tapping it, adding {W}.
Activate Mind over Matter by discarding Treasure Vault, untapping Ancient Den.
Activate Ancient Den by tapping it, adding {W}.
Activate Tameshi by paying {W} and returning Ancient Den from the battlefield to your hand, returning Treasure Vault from your graveyard to the battlefield.
Activate Mind over Matter by discarding Ancient Den, untapping any applicable permanent.
Activate Tameshi by paying {W} and returning Treasure Vault from the battlefield to your hand, returning Ancient Den from your graveyard to the battlefield.
Repeat.

Infinite colored mana

Infinite landfall triggers

Infinite mana permanents you control can produce

Infinite self-discard triggers

Infinite Treasure tokens

Infinite untap of permanents you control

Tameshi, Reality Architect

Mind Over Matter

Ancient Den

Treasure Vault

Activate Treasure Vault by tapping it, creating a Food, a Clue, and a Treasure artifact token.
Activate Clock of Omens by tapping two artifact tokens, untapping Treasure Vault.
Repeat.

Infinite card draw

Infinite Clue tokens

Infinite draw triggers

Infinite Food tokens

Infinite lifegain

Infinite lifegain triggers

Infinite mana artifacts you control can produce

Infinite untap of artifacts you control

Bootleggers' Stash

Academy Manufactor

Clock of Omens

Activate Lotus Bloom by tapping and sacrificing it, adding {W}{W}{W}.
Cast Sculpting Steel by paying {3}, having it enter the battlefield as a copy of Treasure Vault.
Activate Sculpting Steel by tapping it, adding {C}.
Activate Tameshi's second ability by paying {W} and returning Sculpting Steel from the battlefield to your hand.
If it has not triggered this turn, Tameshi's first ability triggers, causing you to draw a card.
Resolve Tameshi's second ability, returning Lotus Bloom from your graveyard to the battlefield.
Repeat.

Infinite storm count

Sculpting Steel

Lotus Bloom

Activate Treasure Vault by tapping it, creating a Food and a Treasure artifact token.
Activate Clock of Omens by tapping the Food and Treasure, untapping Treasure Vault.
Repeat.

Infinite tapped Food tokens

Infinite tapped Treasure tokens

Peregrin Took

Activate Prototype Portal by paying {0} and tapping it, creating a token copy of Treasure Vault.
The Treasure Vault token enters, triggering Grinding Station, untapping Grinding Station.
Activate Clock of Omens by tapping the Treasure Vault token and Grinding Station, untapping Prototype Portal.
Repeat.

Infinite tapped land tokens

Prototype Portal

Grinding Station

Activate Treasure Vault by tapping it, adding {C}.
Activate Karn by paying {1}, causing Treasure Vault to become a creature until end of turn.
Treasure Vault dies as a state-based action due to having 0 toughness, triggering Salvaging Station, untapping Salvaging Station.
Activate Salvaging Station by tapping it, returning Treasure Vault from your graveyard to the battlefield.
Repeat.

Infinite LTB

Infinite death triggers

Karn, Silver Golem

Salvaging Station

Activate Prototype Portal by paying {0}, creating a token copy of Treasure Vault.
When the Treasure Vault token enters the battlefield, Battered Golem triggers, untapping itself.
Activate Clock of Omens by tapping Battered Golem and the Treasure Vault token, untapping Prototype Portal.
Repeat.

Infinite tapped Treasure Vault tokens

Battered Golem

Activate Prototype Portal by tapping it, creating a token copy of Treasure Vault.
When the Treasure Vault token enters the battlefield, Retreat to Coralhelm triggers, untapping Prototype Portal.
Repeat.
Once you have infinite Treasure Vault tokens, you may tap them for infinite mana, and then use a Treasure Vault to create infinite Treasure toknes.

Infinite colorless mana

Infinite Treasure Vault tokens

Retreat to Coralhelm

Ensoul Artifact

Activate Metalworker by tapping it and revealing at least three artifact cards from your hand, adding at least six {C}.
Activate Urza by paying {6}, creating a token copy of Treasure Vault that is a 1/1 Soldier.
When the Treasure Vault token enters the battlefield, Retreat to Coralhelm triggers, untapping Metalworker.
Repeat.
If you have four or more artifact cards in hand, this combo nets infinite colorless mana, and you may target any artifact you control to get infinite copies of them.

Infinite copies of each artifact you control

Infinite creature tokens

Infinite ETB

Infinite creature copies of artifacts you control

Urza, Prince of Kroog

Metalworker

Activate Tawnos' second ability by paying {1}{W}{U}{B}, tapping it, sacrificing two artifact tokens and exiling Treasure Vault from your graveyard, causing you to create a token of Treasure Vault.
When the Treasure Vault token enters the battlefield, Retreat to Coralhelm triggers, untapping Tawnos.
Activate the Treasure Vault token's first ability by tapping it, adding {C}.
Forsaken Monument triggers, adding {C}.
Activate Tawnos' first ability by paying {2} and tapping it, creating a copy of the Treasure Vault token and causing you to mill two cards.
Repeat from step 2.

Infinite self-mill

Tawnos, Solemn Survivor

Forsaken Monument

Combos with "Treasure Vault"