Zacama, Primal Calamity + Panharmonicon + Sparkcaster

Zacama, Primal Calamity

Panharmonicon

Sparkcaster

How it works

1. Activate all mana-producing lands you control by tapping them, adding at least 4.
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 4.
6. Resolve the second Zacama trigger, untapping all lands you control.
7. Cast Sparkcaster by paying 2.
8. When Sparkcaster enters the battlefield, its first and second abilities trigger twice.
9. Resolve the first Sparkcaster triggers, returning itself and Zacama from the battlefield to your hand.
10. Resolve the second Sparkcaster triggers, dealing 2 damage to target player or planeswalker.
11. Repeat.
12. Once you have infinite mana, you may use it to activate Zacama's other abilities.