Cast Turnabout targeting yourself naming untap lands, hold priority.
Activate Mirror Sheen to copy Turnabout.
Let the copy resolve, choosing to untap.
Repeat.

Infinite colored mana

Infinite colorless mana

Turnabout

Mirror Sheen

Cast Lava Spike, targeting yourself.
Splice Desperate Ritual onto Lava Spike.
Hold priority and activate Mirror Sheen, targeting Lava Spike.
Have the copy of Lava Spike target another player.
Resolve the copy of Lava Spike.
Using the RRR from the copy of Lava Spike's text from Desperate Ritual, activate Mirror Sheen, targeting Lava Spike.
Repeat.
Cast Lava Spike by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Lava Spike.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Lava Spike, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Lava Spike, dealing damage to an opponent and adding {R}{R}{R}.
Repeat from step 3.

Infinite magecraft triggers

Infinite damage

Lava Spike

Desperate Ritual

Cast Dampen Thought by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Dampen Thought.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Dampen Thought, which also has the effects of Desperate Ritual, targeting any player.
Resolve Dampen Thought, causing a player to mill four cards and adding {R}{R}{R}.
Repeat from step 3.

Infinite mill

Infinite self-mill

Dampen Thought

Cast Devouring Greed by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Devouring Greed.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Devouring Greed, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Devouring Greed, causing an opponent to lose life, and causing you to gain life and add {R}{R}{R}.
Repeat from step 3.

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Devouring Greed

Cast Stream of Consciousness by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Stream of Consciousness.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Stream of Consciousness, which also has the effects of Desperate Ritual, targeting a player
Resolve Stream of Consciousness, adding {R}{R}{R}.
Repeat from step 3.

Stream of Consciousness

Cast Gaze of Adamaro by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Gaze of Adamaro.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Gaze of Adamaro, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Gaze of Adamaro, dealing damage to an opponent and adding {R}{R}{R}.
Repeat from step 3.

Gaze of Adamaro

Cast Three Tragedies by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Three Tragedies.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Three Tragedies, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Three Tragedies, adding {R}{R}{R}.
Repeat from step 3.

Three Tragedies

Cast Death of a Thousand Stings by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Death of a Thousand Stings.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Death of a Thousand Stings, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Death of a Thousand Stings, causing an opponent to lose 1 life and you to gain 1 life and add {R}{R}{R}.
Repeat from step 3.

Death of a Thousand Stings

Cast Sink into Takenuma by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Sink into Takenuma.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Sink into Takenuma, which also has the effects of Desperate Ritual, targeting a player
Resolve Sink into Takenuma, adding {R}{R}{R}.
Repeat from step 3.

Sink into Takenuma

Cast Cranial Extraction by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Cranial Extraction.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Cranial Extraction, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Cranial Extraction, adding {R}{R}{R}.
Repeat from step 3.

Cranial Extraction

Cast Waking Nightmare by paying its mana cost, targeting yourself.
Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Waking Nightmare.
Holding priority, activate Mirror Sheen by paying {1}{U/R}{U/R}, copying Waking Nightmare, which also has the effects of Desperate Ritual, targeting an opponent.
Resolve Waking Nightmare, adding {R}{R}{R}.
Repeat from step 3.

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