Cast Retraction Helix by paying {U}, giving Nettle Drone an activated ability until end of turn.
Activate Nettle Drone by tapping it, returning the nonland permanent to your hand from the battlefield.
Cast the free permanent by paying {0}.
Nettle Drone triggers, untapping itself.
Let the free permanent resolve and enter the battlefield.
Repeat from step 2.

Infinite artifact ETB

Infinite artifact LTB

Infinite creature ETB

Infinite creature LTB

Infinite storm count

Colorless permanent castable for {0} that survives

Nettle Drone

Retraction Helix

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.

Sewer-veillance Cam

Cast Retraction Helix by paying {U}, targeting Battered Golem.
Cast the artifact by paying {0}.
When the artifact enters the battlefield, Battered Golem triggers, untapping Battered Golem.
Activate Battered Golem by tapping it, returning the artifact from the battlefield to your hand.
Repeat from step 2.

Artifact Castable for {0} that survives

Battered Golem

Cast Retraction Helix by paying {U}, targeting a creature you control.
Cast the artifact by paying {0}.
Mirran Spy triggers, untapping the creature targeted by Retraction Helix.
Activate the creature by tapping it, returning the artifact from the battlefield to your hand.
Repeat from step 2.

Mirran Spy

Cast Retraction Helix by paying {U}, targeting any non-mana producing creature you control that does not have summoning sickness.
Activate all mana-producing creatures you control by tapping them, adding at least {1}.
Cast the creature from your hand by paying its mana cost.
When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Activate the creature targeted by Retraction Helix by tapping it, returning the creature cast in step 3 to your hand from the battlefield.
Repeat from step 2.

Infinite mana creatures you control can produce

Infinite untap of creatures

Intruder Alarm

Cast Retraction Helix by paying {U}, targeting Traxos.
Cast any historic card from your hand by paying {0}.
Traxos triggers, untapping itself.
Activate Traxos by tapping it, returning the historic card from the battlefield to your hand.
Repeat from step 2.

Traxos, Scourge of Kroog

Cast Retraction Helix by paying {U}, targeting any creature you control without summoning sickness.
Cast the permanent by paying {0}.
Chakram Retriever triggers, untapping the creature targeted by Retraction Helix.
Activate the creature targeted by Retraction Helix by tapping it, returning the permanent cast in step 2 from the battlefield to your hand.
Repeat from step 2.

Permanent castable for {0} that survives

Chakram Retriever

Cast Retraction Helix by paying {U}, targeting Steelfin Whale.
Activate Steelfin Whale by tapping it, returning the artifact from the battlefield to your hand.
Cast the artifact by paying {0}.
When the artifact enters the battlefield, Steelfin Whale triggers, untapping Steelfin Whale.
Repeat from step 2.

Steelfin Whale

Cast Retraction Helix by paying {U}, targeting Zephyr Scribe.
Activate Zephyr Scribe by tapping it, returning the noncreature, nonland permanent from the battlefield to your hand.
Cast the noncreature, nonland permanent by paying {0}.
Zephyr Scribe triggers, untapping itself.
Repeat from step 2.

Zephyr Scribe

Cast Banishing Knack by paying {U}, giving Nettle Drone an activated ability until end of turn.
Activate Nettle Drone by tapping it, returning the nonland permanent to your hand from the battlefield.
Cast the free permanent by paying {0}.
Nettle Drone triggers, untapping itself.
Let the free permanent resolve and enter the battlefield.
Repeat from step 2.

Banishing Knack

Cast Banishing Knack by paying {U}, targeting Midnight Guard.
Activate Midnight Guard by tapping it, returning the creature that costs no mana from the battlefield to your hand.
Cast that creature by paying {0}.
When that creature enters, Midnight Guard triggers, untapping Midnight Guard.
Repeat from step 2.

Creature castable for {0} that survives

Midnight Guard

Cast Banishing Knack by paying {U}, targeting Sunstrike Legionnaire.
Activate Sunstrike Legionnaire by tapping it, returning the creature that costs no mana from the battlefield to your hand.
Cast that creature by paying {0}.
When that creature enters, Sunstrike Legionnaire triggers, untapping Sunstrike Legionnaire.
Repeat from step 2.

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