Cast Storm King's Thunder by paying {9}{R}{R}{R}, copying the next instant or sorcery spell you cast nine times.
Cast Prologue to Phyresis by paying {1}{U}.
Storm King's Thunder triggers, copying Prologue to Phyresis nine times.
Resolve each Prologue to Phyresis, causing each opponent to get ten poison counters and you to draw ten cards.
Each opponent loses the game due to having ten or more poison counters.

Each opponent loses the game

Storm King's Thunder

Prologue to Phyresis

Cast Storm King's Thunder by paying {9}{R}{R}{R}, copying the next instant or sorcery spell you cast nine times.
Cast Infectious Inquiry by paying {2}{B}.
Storm King's Thunder triggers, copying Infectious Inquiry nine times.
Resolve each Infectious Inquiry, causing each opponent to get ten poison counters, and you to lose twenty life and draw twenty cards.
Each opponent loses the game due to having ten or more poison counters.

Infectious Inquiry

Cast Storm King's Thunder by paying {9}{R}{R}{R}, copying the next instant or sorcery spell you cast nine times.
Cast Vraska's Fall by paying {2}{B}.
Storm King's Thunder triggers, copying Vraska's Fall nine times.
Resolve each Vraska's Fall, causing each opponent to get ten poison counters.
Each opponent loses the game due to having ten or more poison counters.

Vraska's Fall

Cast Storm King's Thunder by paying {9}{R}{R}{R}, copying the next instant or sorcery spell you cast nine times.
Cast Infectious Bite by paying {1}{G}.
Storm King's Thunder triggers, copying Infectious Bite nine times.
Resolve each Infectious Bite, causing each opponent to get ten poison counters.
Each opponent loses the game due to having ten or more poison counters.

Infectious Bite

Cast Storm King's Thunder by paying {2}{R}{R}{R}, copying the next instant or sorcery spell you cast twice.
Cast Biovisionary by paying {1}{G}{U}.
Holding priority, cast Double Major by paying {G}{U}, targeting Biovisionary.
Storm King's Thunder triggers, copying Double Major twice, with both copies targeting Biovisionary.
Resolve all Double Majors, creating three copies of the Biovisionary spells.
Resolve all Biovisionary spells, causing you to have a nontoken Biovisionary and three token Biovisionaries.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Win the game

Biovisionary

Double Major

Cast Storm King's Thunder by paying {9}{R}{R}{R}, copying the next instant or sorcery spell you cast nine times.
Cast Phyresis Outbreak by paying {2}{B}.
Storm King's Thunder triggers, copying Phyresis Outbreak nine times.
Resolve each Phyresis Outbreak, causing each opponent to get ten poison counters.
Each opponent loses the game due to having ten or more poison counters.

Phyresis Outbreak

Cast Storm King's Thunder by paying {2}{R}{R}{R}, copying the next instant or sorcery spell you cast twice.
Cast Quasiduplicate by paying {1}{U}{U}, targeting Biovisionary.
Storm King's Thunder triggers, copying Quasiduplicate twice, with both copies targeting Biovisionary.
Resolve all Quasiduplicates, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Quasiduplicate

Cast Storm King's Thunder by paying {2}{R}{R}{R}, copying the next instant or sorcery spell you cast twice.
Cast Cackling Counterpart by paying {1}{U}{U}, targeting Biovisionary.
Storm King's Thunder triggers, copying Cackling Counterpart twice, with both copies targeting Biovisionary.
Resolve all Cackling Counterparts, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Cackling Counterpart

Cast Storm King's Thunder by paying {R}{R}{R} plus an additional {1} for every twenty life your opponents collectively have, copying the next instant or sorcery spell you cast that many times.
Cast Scheming Symmetry by paying {B}.
Storm King's Thunder triggers, copying Scheming Symmetry at least once.
Resolve a Scheming Symmetry, causing two opponents to search their library for a card, and then shuffle their libraries and put the card on top of it.
Ob Nixilis triggers for each opponent who searched their library, causing them to lose ten life.
Repeat from step 4 for each remaining Scheming Symmetry.

Near-infinite lifeloss

Ob Nixilis, Unshackled

Scheming Symmetry

Cast Storm King's Thunder by paying {1}{R}{R}{R}, copying the next instant or sorcery spell you cast once.
Cast Reality Spasm by paying at least {3}{U}{U}, targeting at least three permanents and choosing the untap mode.
Storm King's Thunder triggers, copying Reality Spasm, targeting at least three permanents.
Holding priority, activate at least two mana-producing permanents you control by tapping them, adding at least {1}{U}.
Activate Errant by paying {1}{U} and tapping it, copying the Reality Spasm copy, targeting Errant and at least two mana-producing permanents you control.
Resolve the copy of Reality Spasm from step 3, untapping Errant and at least two mana-producing permanents you control.
Repeat from step 4.

Infinite magecraft triggers

Infinite mana permanents you control can produce

Infinite untap of permanents you control

Errant, Street Artist

Reality Spasm

Cast Storm King's Thunder by paying {2}{R}{R}{R}, copying the next instant or sorcery spell you cast twice.
Cast Croaking Counterpart by paying {1}{G}{U}, targeting Biovisionary.
Storm King's Thunder triggers, copying Croaking Counterpart twice, with both copies targeting Biovisionary.
Resolve all Croaking Counterparts, creating three token copies of Biovisionary that are 1/1 Frogs.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Croaking Counterpart

Cast Storm King's Thunder by paying {1}{R}{R}{R}.
Cast Arcbond by paying {2}{R}, targeting Bloodthirsty Conqueror.
Storm King's Thunder triggers, opying Arcbond, with the copy targeting another indestructible creature you control.
Resolve both Arcbonds.
Deal damage to Bloodthirsty Conqueror.
Arbond triggers, dealing that much damage to each player and each other creature.
Bloodthirsty Conqueror triggers for each opponent dealt damage, and Arcbond triggers due to the other indestructible creature being dealt damage.
Resolve all Bloodthirsty Conqueror triggers, causing you to gain life.
Resolve the Arcbond trigger, dealing that much damage to each player and each other creature.
Bloodthirsty Conqueror triggers for each opponent dealt damage, and Arcbond triggers due to Bloodthirsty Conqueror being dealt damage.
Resolve all Bloodthirsty Conqueror triggers, causing you to gain life.
Resolve the Arcbond trigger, dealing that much damage to each player and each other creature.
Repeat form step 7.

Combos with "Storm King's Thunder"