Livio, Oathsworn Sentinel + Palinchron + Sparring Mummy

Livio, Oathsworn Sentinel

Palinchron

Sparring Mummy

How it works

1. Activate up to seven mana-producing lands by tapping them, adding at least 5.
2. Activate Livio's first ability twice by paying 2, exiling Palinchron and Sparring Mummy with aegis counters on them.
3. Activate Livio's second ability by paying 2 and tapping it, returning Palinchron and Sparring Mummy from exile to the battlefield.
4. Sparring Mummy and Palinchron enter the battlefield, triggering their abilities.
5. Resolve the Palinchron trigger, untapping up to seven lands you control.
6. Resolve the Sparring Mummy trigger, untapping Livio.
7. Repeat.