Activate Sol Ring by tapping it, adding {C} {C}.
Cast the permanent that can be cast using {C} by paying its mana cost.
Hullbreaker Horror triggers, returning Sol Ring from the battlefield to your hand.
Cast Sol Ring by paying {1}. 
Hullbreaker Horror triggers, returning the permanent cast in step 2 from the battlefield to your hand.
Repeat.
If the permanent can be cast by paying {0}, this combo nets infinite colorless mana.

Infinite colorless mana

Infinite storm count

Permanent Castable for {C}

Hullbreaker Horror

Sol Ring

Cast Sol Ring by paying its mana cost.
Tidespout Tyrant triggers, returning a nontoken permanent that can be cast using {C} from the battlefield to your hand.
Activate Sol Ring by tapping it, adding {C}{C}.
Cast the nontoken permanent returned in step 2 by paying its mana cost.
Tidespout Tyrant triggers, returning Sol Ring from the battlefield to your hand.
Repeat.

Tidespout Tyrant

Cast Banishing Knack by paying {U}, targeting a Bird, Rat, Otter and/or Frog you control that does not have summoning sickness.
Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
Resolve Banishing Knack.
Cast Sol Ring by paying its mana cost.
Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
Activate Sol Ring by tapping it, adding {C}{C}.
Activate the creature targeted by Banishing Knack by tapping it, returning Sol Ring from the battlefield to your hand.
Repeat from step 4.

Infinite untap of some creatures you control

Infinite power and toughness for certain creatures until end of turn

Valley Floodcaller

Banishing Knack

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.

Infinite artifact ETB

Infinite artifact LTB

Sewer-veillance Cam

Cast Banishing Knack by paying {U}, targeting Battered Golem.
Activate Sol Ring by tapping it, adding {C}{C}.
Activate Battered Golem by tapping it, returning Sol Ring from the battlefield to your hand.
Cast Sol Ring by paying {1}.
Sol Ring enters the battlefield, triggering Battered Golem, untapping Battered Golem.
Repeat from step 2.

Battered Golem

Cast Banishing Knack by paying {U}, targeting Mirran Spy.
Activate Sol Ring by tapping it, adding {C}{C}.
Activate Mirran Spy by tapping it, returning Sol Ring from the battlefield to your hand.
Cast Sol Ring by paying {1}.
Mirran Spy triggers, untapping itself.
Repeat from step 2.

Infinite creature ETB

Infinite creature LTB

Mirran Spy

Cast Banishing Knack 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 Banishing Knack 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 Banishing Knack 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 Banishing Knack by paying {U}, giving Steelfin Whale an activated ability until end of turn.
Activate Steelfin Whale by tapping it, returning the free artifact from the battlefield to your hand.
Cast that artifact by paying {0}.
When that artifact enters the battlefield, it triggers Steelfin Whale, untapping it.
Repeat from step 2.

Artifact Castable for {0} that survives

Steelfin Whale

Cast Banishing Knack by paying {0}, 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

Create an artifact token.
When the artifact enters the battlefield, Steelfin Whale triggers, untapping itself.
Activate Steelfin Whale by tapping it, creating a copy of the artifact token.
Repeat from step 2.

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