Zacama, Primal Calamity + Panharmonicon + Horned Kavu

Zacama, Primal Calamity

Panharmonicon

Horned Kavu

How it works

1. Activate all mana-producing lands you control by tapping them, adding at least 3.
2. Cast Zacama either from your hand or from the command zone by paying 6 plus commander tax, if applicable.
3. When Zacama enters the battlefield, it triggers twice.
4. Resolve the first trigger, untapping all lands you control.
5. Activate all mana-producing lands you control by tapping them, adding at least 3.
6. Resolve the second Zacama trigger, untapping all lands you control.
7. Cast Horned Kavu by paying .
8. When Horned Kavu enters the battlefield, it triggers twice, returning itself and Zacama from the battlefield to your hand.
9. Repeat.
10. Once you have infinite mana, you may use it to activate Zacama's other abilities.