Rootha, Mercurial Artist, Seething Song, Storm-Kiln Artist, and Emergence Zone

Prerequisites

• Rootha, Mercurial Artist on the battlefield
• Seething Song in hand
• Storm-Kiln Artist on the battlefield
• Emergence Zone on the battlefield
• available

Steps

1. Activate Emergence Zone's second ability by paying , tapping and sacrificing it, allowing you to cast spells as though they have flash this turn
2. Cast Seething Song by paying
3. Storm-Kiln Artist triggers, creating a Treasure token
4. Activate a Treasure by tapping and sacrificing it, adding
5. Holding priority, activate Rootha by paying and returning it from the battlefield to your hand, copying Seething Song
6. Storm-Kiln Artist triggers, creating a Treasure token
7. Resolve the Seething Song copy, adding
8. Activate a Treasure by tapping and sacrificing it, adding
9. Cast Rootha by paying
10. Repeat from step 5

Results

• Infinite LTB
• Infinite ETB
• Infinite storm count
• Infinite red mana
• Infinite magecraft triggers