Activate Grinning Ignus by paying {R} and returning it from the battlefield to your hand, adding {C}{C}{R}.
Cast Grinning Ignus by paying {2}{R}.
Birgi triggers, adding {R}.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite storm count

Birgi, God of Storytelling // Harnfel, Horn of Bounty

Grinning Ignus

If Runaway Steam-Kin has three or more +1/+1 counters on it, activate it by removing three +1/+1 counters from it, adding {R}{R}{R}.
Cast Grinning Ignus by paying {2}{R}.
Runaway Steam-Kin triggers, putting a +1/+1 counter on it.
Activate Grinning Ignus by paying {R} and returning it from the battlefield to your hand, adding {C}{C}{R}.
Repeat.

Runaway Steam-Kin

Cast Marvin by paying {2}.
Activate Marvin using Grinning Ignus's ability by paying {R} and returning Marvin from the battlefield to your hand, adding {C}{C}{R}.
Repeat.

Marvin, Murderous Mimic

Activate Grinning Ignus by paying {R} and returning it from the battlefield to your hand, adding {C}{C}{R}.
Cast Grinning Ignus by paying {2}{R}.
The Vision and Scarlet Witch triggers, adding {R} and putting a +1/+1 counter on it.
Repeat.

Infinite +1/+1 counters on a creature

The Vision and Scarlet Witch

Cast Grinning Ignus without paying its mana cost.
Activate Grinning Ignus by paying {R}, returning it to your hand and adding {C}{C}{R}.
Repeat.

Infinite colorless mana

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Aluren

Activate Grinning Ignus by paying {R} and returning it to your hand from the battlefield, adding {C}{C}{R}.
Cast Grinning Ignus by paying {2} due to Morophon.
Repeat.

Morophon, the Boundless

Activate Earthcraft by tapping Grinning Ignus, untapping your Mountain.
Tap the Mountain for {R}.
Pay {R} and return Grinning Ignus to your hand, adding {C}{C}{R}.
Cast Grinning Ignus.
Repeat.

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