Requires

Storm-Kiln Artist must be on the battlefield. Thousand-Year Storm must be on the battlefield. Narset's Reversal must be in hand. You have another instant and/or sorcery card in hand that can be cast using X or less colored mana, where X is equal to four plus twice the number of instants and sorceries you've cast this turn. You have enough mana to cast the additional instant or sorcery, plus an additional Mana needed: if you have not cast an instant or sorcery this turn

Steps

1. Cast any other instant or sorcery spell by paying its mana cost.
2. Storm-Kiln Artist triggers, as well as Thousand-Year Storm if you've cast another instant and/or sorcery spell this turn.
3. Resolve the Storm-Kiln Artist trigger, creating a Treasure artifact token.
4. Resolve the Thousand-Year Storm trigger, if applicable, copying the spell at least once.
5. Storm-Kiln Artist triggers for each copy made this way, creating that many Treasure artifact tokens.
6. Resolve each copy of the instant or sorcery.
7. Holding priority, activate two Treasures by tapping and sacrificing them, adding .
8. Cast Narset's Reversal by paying , targeting the spell cast in step 1.
9. Thousand-Year Storm and Storm-Kiln Artist trigger.
10. Resolve the Storm-Kiln Artist trigger, creating a Treasure artifact token.
11. Resolve the Thousand-Year Storm trigger, creating at least one copy of Narset's Reversal, with each copy targeting the original Narset's Reversal.
12. Storm-Kiln Artist triggers for each copy made this way, creating that many Treasure artifact tokens.
13. Resolve the first copy of Narset's Reversal, copying Narset's Reversal with the copy targeting the spell cast in step 1, and then returning the original Narset's Reversal to your hand.
14. All remaining Narset's Reversal copies made in step 11 fizzle due to having no legal target.
15. Storm-Kiln Artist triggers, creating a Treasure artifact token.
16. Resolve the Narset's Reversal copy from step 13, copying the spell it is targeting and returning the original spell to your hand.
17. Storm-Kiln Artist triggers, creating a Treasure artifact token.
18. Resolve the copy of the spell.
19. Activate any number of Treasures by tapping and sacrificing them, adding enough mana to cast the additional instant or sorcery.
20. Repeat.
21. Once you have infinite mana, you may repeat this combo targeting any other instant and/or sorcery card in your hand and/or on the stack.

Results