Prismari, the Inspiration, Inspired Skypainter // Maestro's Gift, and Mirror Gallery

Prerequisites

• Prismari, the Inspiration on the battlefield
• Inspired Skypainter // Maestro's Gift on the battlefield
• Mirror Gallery on the battlefield
• available

Steps

1. Cast a copy of Maestro's Gift by paying , targeting Inspired Skypainter
2. Maestro's Gift's storm ability triggers, copying it for each spell cast before it this turn
3. Choose to have each copy target Prismari
4. Resolve the first copy of Maestro's Gift targeting Prismari, creating a token copy of Prismari with haste
5. Repeat step 3 for each remaining copy of Maestro's Gift that targets Prismari
6. Resolve the final copy of Maestro's Gift, creating a token copy of Inspiried Skypainter with haste
7. It'll enter prepared due to its static effect
8. Cast a copy of Maestro's Gift by paying , targeting Inspired Skypainter
9. Maestro's Gift will have a storm ability for each Prismari you control, and each storm ability will trigger
10. Resolve the first storm trigger, copying Maestro's Gift for each spell cast before it this turn
11. Choose to have each copy target Prismari
12. Repeat step 3 for each copy created in step 8
13. Repeat steps 8 and 9 for each remaining storm trigger from step 7
14. Repeat from step 5 as mana allows

Results

• Near-infinite ETB
• Near-infinite creature tokens with haste