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 that can be cast using {C}

Hullbreaker Horror

Sol Ring

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

Permanent that can be cast using {C}{C}

Mana Crypt

Activate Mana Vault by tapping it, adding {C}{C}{C}.
Cast the permanent that can be cast using {C}{C} from your hand by paying its mana cost.
Hullbreaker Horror triggers, returning Mana Vault from the battlefield to your hand.
Cast Mana Vault 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 using {C} or less, this combo nets infinite colorless mana.

Mana Vault

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

Activate any number of creatures you control by tapping them, adding an amount of mana.
Cast the creature from your hand by paying its mana cost.
Hullbreaker Horror triggers, returning another creature from the battlefield to your hand.
Resolve the creature spell. When it enters, Intruder Alarm triggers, untapping all creatures.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures

Infinite untap of creatures you control

Infinite ETB

Infinite LTB

Intruder Alarm

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

Activate Sol Ring and a land by tapping them, adding at least {C}{C}{U}.
Cast Wormfang Newt by paying {1}{U}.
Hullbreaker Horror triggers, returning Sol Ring from the battlefield to your hand.
When Wormfang Newt enters, its first ability triggers, exiling the land tapped in step 1
Cast Sol Ring by paying {1}.
Hullbreaker Horror triggers, returning Wormfang Newt from the battlefield to your hand.
Wormfang Newt's second ability triggers, returning the Iand from exile to the battlefield.
Repeat.

Infinite landfall triggers

Wormfang Newt

Cast the card with affinity in your hand by paying {0}.
Hullbreaker Horror triggers, returning the other affinity card from the battlefield to your hand.
Resolve the spell cast in step 1.
Repeat.

Permanent with Affinity and a Generic Mana Cost

Cast one of the permanents from your hand by paying {0}.
Hullbreaker Horror triggers; choose to return nothing.
That permanent enters the battlefield.
Cast one of the permanents from your hand by paying {0}.
Hullbreaker Horror triggers, returning the other permanent from the battlefield to your hand.
The permanent you cast enters the battlefield.
Repeat from step 4.

Permanent castable for {0} that does not die on entering

Cast any creature card by paying {0} due to Animar.
Animar and Hullbreaker Horror triggers.
Resolve the Animar trigger, putting a +1/+1 counter on it.
Resolve the Hullbreaker Horror trigger, returning another creature that can be cast by paying {0} due to Animar from the battlefield to your hand.
Resolve the creature spell cast in step 1.
Repeat.

Infinite +1/+1 counters on a creature

Animar, Soul of Elements

Cast the instant or sorcery by paying its mana cost.
Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery.
Resolve the copy of the instant or sorcery, untapping Stella Lee.
Repeat from step 2.

Infinite copies of one instant or sorcery

Infinite magecraft triggers

Instant or Sorcery that untaps a Creature

Stella Lee, Wild Card

Cast Moritte either from your hand or from the command zone by paying {2}{G}{U}{U} plus commander tax if applicable. Choose to have it enter as a copy of the persist creature that is still legendary.
Put Moritte into your graveyard due to the legend rule. When it dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to its ability. Choose to have it enter as a copy of the persist creature that is still legendary.
Repeat step 2.

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