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

Activate the mana-producing creature by tapping it, adding at least {U}.
Cast Retraction Helix by paying {U}, targeting the mana-producing creature.
Cast Sewer-veillance Cam by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping the creature targeted by Retraction Helix.
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 targeted by Retraction Helix.
Activate the mana-producing creature by tapping it, adding at least {U}.
Repeat from step 3.

Infinite storm count

Retraction Helix

Activate the mana-producing creature by tapping it, adding at least {U}.
Cast Banishing Knack by paying {U}, targeting the mana-producing creature.
Cast Sewer-veillance Cam by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping the creature targeted by Banishing Knack.
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 targeted by Banishing Knack.
Activate the mana-producing creature by tapping it, adding at least {U}.
Repeat from step 3.

Banishing Knack

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 from step 2.

Cast all spells in your library

Exile your library

Infinite blue mana

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Urza, Lord High Artificer

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 from step 2

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

If Sewer-veillance Cam is in your graveyard, activate Emry by tapping it, targeting Sewer-veillance Cam.
Cast Sewer-veillance Cam either from your hand or from your graveyard by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping Technodrome.
Activate Urza by tapping Sewer-veillance Cam, adding {U}.
Activate Technodrome by tapping it and sacrificing Sewer-veillance Cam, causing you to draw a card and put a +1/+1 counter on Technodrome.
Sewer-veillance Cam triggers, untapping Emry.
Repeat.

Near-infinite +1/+1 counters on a creature

Near-infinite storm count

Technodrome

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.

Infinite colored mana

Infinite copies of artifacts you control with haste

Infinite creature tokens with haste

Chrome Dome

Mona Lisa, Science Geek

If Sewer-veillance Cam is in your graveyard, activate Emry by tapping it, targeting Sewer-veillance Cam.
Cast Sewer-veillance Cam either from your hand or from your graveyard by paying {U}.
When Sewer-veillance Cam enters, it triggers, untapping Technodrome.
Activate Sewer-veillance Cam by tapping it, adding {U} that cannot be spent to cast spells from your hand.
Activate Technodrome by tapping it and sacrificing Sewer-veillance Cam, causing you to draw a card and put a +1/+1 counter on Technodrome.
Sewer-veillance Cam triggers, untapping Emry.
Repeat.

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