The Chain Veil + Tezzeret the Seeker + Ral Zarek + Gilded Lotus

The Chain Veil

Tezzeret the Seeker

Ral Zarek

Gilded Lotus

How it works

1. Activate Gilded Lotus by tapping it, adding three mana of any color.
2. Activate Tezzeret the Seeker's first loyalty ability by putting a loyalty counter on it, untapping The Chain Veil and Gilded Lotus.
3. Activate Gilded Lotus by tapping it, adding three mana of any color.
4. Activate Ral Zarek's first loyalty ability by putting a loyalty counter on it, tapping any permanent and untapping Gilded Lotus.
5. Activate The Chain Veil by paying 4 and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn.
6. Repeat any number of times.
7. Once you have infinite mana, you no longer need to untap Gilded Lotus, allowing you to activate Ral Zarek's and Tezzeret the Seeker's other abilities (alternating each turn).