Activate Goblin Welder by tapping it, causing you to sacrifice Sewer-veillance Cam and return another artifact from your graveyard to the battlefield.
Sewer-veillance Cam triggers, untapping Goblin Welder.
Activate Goblin Welder by tapping it, causing you to sacrifice the artifact returned in step 1 and return Sewer-veillance Cam from your graveyard to the battlefield.
When Sewer-veillance Cam enters, it triggers, untapping Goblin Welder.
Repeat.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite recursion of artifact creatures you control

Infinite sacrifice triggers

Goblin Welder

Sewer-veillance Cam

Cast Retraction Helix by paying {U}, targeting a creature you control that doesn't have summoning sickness.
Cast Sewer-veillance Cam by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping a creature you control.
Activate Urza's first ability by tapping Sewer-veillance Cam, adding {U}.
Activate the creature targeted by Retraction Helix by tapping it, returning Sewer-veillance Cam from the battlefield to your hand.
When Sewer-veillance Cam leaves the battlefield, it triggers, untapping the creature tapped in step 5.
Repeat.

Cast all spells in your library

Exile your library

Infinite blue mana

Infinite mana creatures you control can produce

Infinite storm count

Infinite untap of creatures you control

Urza, Lord High Artificer

Retraction Helix

Cast Banishing Knack by paying {U}, targeting a creature you control that doesn't have summoning sickness.
Cast Sewer-veillance Cam by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping a creature you control.
Activate Urza's first ability by tapping Sewer-veillance Cam, adding {U}.
Activate the creature targeted by Banishing Knack by tapping it, returning Sewer-veillance Cam from the battlefield to your hand.
When Sewer-veillance Cam leaves the battlefield, it triggers, untapping the creature tapped in step 5.
Repeat.

Banishing Knack

Activate Emry by tapping it, allowing you to cast Sewer-veillance Cam from your graveyard this turn.
Activate a creature by tapping it, adding at least {U}.
Cast Sewer-veillance Cam from your graveyard by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping Emry.
Activate Krark-Clan Ironworks by sacrificing Sewer-veillance Cam.
Sewer-veillance Cam triggers, untapping the mana-producing creature.
Repeat.

Infinite colorless mana

Emry, Lurker of the Loch

Krark-Clan Ironworks

Activate Emry by tapping it, allowing you to cast Sewer-veillance Cam from your graveyard this turn.
Cast Sewer-veillance Cam from your graveyard by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping Emry.
Activate Urza's first ability by tapping Sewer-veillance Cam, adding {U}.
Activate Krark-Clan Ironworks by sacrificing Sewer-veillance Cam.
Sewer-veillance Cam triggers, untapping a creature you control.
Repeat.

Infinite card draw

Infinite draw triggers

Activate Mona Lisa by tapping it, adding at least five mana of any color.
Activate Chrome Dome by paying {5}, creating a token copy of Sewer-veillance Cam.
When the Sewer-veillance Cam token enters, it triggers, untapping Mona Lisa.
Repeat.

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