Storm-Kiln Artist, Flamehold Grappler, Narset's Reversal, and Mythos of Illuna

Prerequisites

• Storm-Kiln Artist on the battlefield
• Flamehold Grappler in hand
• Narset's Reversal in hand
• Mythos of Illuna in hand
• undefined plus enough mana to cast the spell that creates a token copy available

Steps

1. Cast Flamehold Grappler by paying
2. When Flamehold Grappler enters the battlefield, it triggers, copying the next spell you cast this turn
3. Cast Mythos of Illuna by paying its mana cost, targeting Flamehold Grappler
4. Flamehold Grappler and Storm-Kiln Artist trigger
5. Resolve the Storm-Kiln Artist trigger, creating a Treasure token
6. Resolve the Flamehold Grappler trigger, copying Mythos of Illuna, with the copy targeting Flamehold Grappler
7. Storm-Kiln Artist triggers, creating a Treasure token
8. Resolve the copy of Mythos of Illuna, creating a token copy of Flamehold Grappler
9. When the token Flamehold Grappler enters the battlefield, it triggers, copying the next spell you cast this turn
10. Holding priority, activate two Treasures by tapping and sacrificing them, adding
11. Cast Narset's Reversal by paying , targeting Mythos of Illuna Flamehold Grappler and Storm-Kiln Artist trigger
12. Resolve the Storm-Kiln Artist trigger, creating a Treasure token
13. Resolve the Flamehold Grappler trigger, copying Narset's Reversal, with the copy targeting the original Narset's Reversal
14. Storm-Kiln Artist triggers, creating a Treasure token
15. Resolve the copy of Narset's Reversal, returning the original Narset's Reversal to your hand and creating a copy of Narset's Reversal targeting Mythos of Illuna
16. Storm-Kiln Artist triggers, creating a Treasure token
17. Resolve the Narset's Reversal copy, returning Mythos of Illuna to your hand and creating a copy of Mythos of Illuna targeting Flamehold Grappler
18. Storm-Kiln Artist triggers, creating a Treasure token
19. Resolve the Mythos of Illuna copy, creating a token copy of Flamehold Grappler
20. When the token Flamehold Grappler enters the battlefield, it triggers, copying the next spell you cast
21. Activate up to four Treasures by tapping and sacrificing them, adding enough mana to cast Mythos of Illuna
22. Repeat from step 3

Results

• Infinite ETB
• Infinite storm count
• Infinite creature tokens
• Infinite magecraft triggers