Magosi, the Waterveil, The Ozolith, Lulu, Stern Guardian, and Natural Emergence

Prerequisites

• Magosi, the Waterveil on the battlefield
• The Ozolith on the battlefield
• Lulu, Stern Guardian on the battlefield
• Natural Emergence on the battlefield
• available

Steps

1. During your precombat main phase, use Lulu to put an additional eon counter on Magosi
2. Activate Magosi's third ability by tapping it, removing an eon counter from it and returning it from the battlefield to your hand
3. When Magosi leaves the battlefield, The Ozolith's first ability triggers due to Natural Emergence, putting an eon counter on The Ozolith
4. Resolve the Magosi ability, causing you to take an extra turn after this one
5. Play Magosi
6. At the beginning of your combat phase, The Ozolith triggers, moving an eon counter from itself onto Magosi
7. Repeat each turn

Results

• Infinite turns
• Lock