Magosi, the Waterveil + The Ozolith + Living Plane + Contagion Clasp

Magosi, the Waterveil

The Ozolith

Living Plane

Contagion Clasp

How it works

1. During your precombat main phase, activate Contagion Clasp by paying 4 and tapping it, putting an 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, 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, putting an eon counter on Magosi.
7. Repeat each turn.

This fascinating loop turns Magosi, the Waterveil into a perpetual engine for extra turns by leveraging Living Plane to treat lands as creatures, allowing The Ozolith to safely catch and preserve the eon counter as Magosi bounces to your hand. Normally, Magosi's extra-turn ability requires you to skip your next turn and return it to your hand, but because The Ozolith intercepts that eon counter right as Magosi leaves the battlefield, you can replay the land and have The Ozolith's combat trigger place the counter right back on it. Meanwhile, Contagion Clasp serves as an alternative activator to seed that crucial first eon counter onto the land without ever needing to skip your turn.