Spellweaver Helix, Deadeye Navigator, and Spellbook Seeker // Careful Study

Prerequisites

• Spellweaver Helix on the battlefield
• Deadeye Navigator on the battlefield
• Spellbook Seeker // Careful Study on the battlefield
• available

Steps

1. Cast the non-card copy of the spell in exile by paying its mana cost, unpreparing Spellbook Seeker // Careful Study
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 Deadeye Navigator by paying mana, flickering Spellbook Seeker // Careful Study, which enters prepared
5. Repeat each turn

Results

• Infinite turns
• Lock