Spellweaver Helix, Lilysplash Mentor, and Emeritus of Woe // Demonic Tutor

Prerequisites

• Spellweaver Helix on the battlefield
• Lilysplash Mentor on the battlefield
• Emeritus of Woe // Demonic Tutor on the battlefield
• available

Steps

1. Cast the non-card copy of the spell in exile by paying its mana cost, unpreparing Emeritus of Woe // Demonic Tutor
2. When you cast that spell, Spellweaver Helix's last ability triggers, allowing you to cast a copy of the Extra Turn Sorcery without paying its mana cost and take an extra turn after this one
3. Resolve the spell from step 1
4. Activate Lilysplash Mentor by paying mana, flickering Emeritus of Woe // Demonic Tutor, which enters prepared
5. Repeat each turn

Results

• Infinite turns
• Lock