Magosi, the Waterveil + Portent Tracker + Rings of Brighthearth

Magosi, the Waterveil

Portent Tracker

Rings of Brighthearth

How it works

1. Activate Magosi's second activated ability by paying and tapping it.
2. Rings of Brighthearth triggers. Choose not to pay.
3. Resolve the Magosi ability, putting an eon counter on it and skipping your next turn.
4. Activate Portent Tracker by tapping it, targeting Magosi.
5. Rings of Brighthearth triggers. Choose not to pay.
6. Resolve the Portent Tracker ability, untapping Magosi.
7. Activate Magosi's third activated ability by tapping it, removing an eon counter from it, and returning it to your hand.
8. Rings of Brighthearth triggers, causing you to pay 2 to copy Magosi's ability.
9. Resolve both instances of Magosi's ability, causing you to take two extra turns after this one.
10. Play Magosi.
11. Move to your second extra turn. The first extra turn will be skipped due to the ability activated in step 1.
12. Repeat.