Spellweaver Helix, Regrowth, Emeritus of Abundance // Regrowth, and Turnabout

Prerequisites

• Spellweaver Helix on the battlefield
• Regrowth in exile
• Emeritus of Abundance // Regrowth on the battlefield
• Turnabout in hand
• available

Steps

1. Cast Turnabot by paying , untapping at least eight lands
2. Cast a copy of Regrowth from exile by paying , targeting [[Untapper]]
3. Spellweaver Helix's last ability triggers, allowing you to cast the Extra Combat Sorcery, giving you an additional combat phase and an additional main phase this turn
4. Resolve the copy of Regrowth, returning Turnabout from your graveyard to your hand
5. Declare Emeritus of Abundance as an attacker
6. When Emeritus of Abundance attacks, it triggers, becoming prepared
7. Repeat each main phase

Results

• Infinite combat phases
• Infinite magecraft triggers