Mobile Garrison + Hellkite Charger + Nyx Lotus

Mobile Garrison

Hellkite Charger

Nyx Lotus

How it works

1. Declare Mobile Garrison and Hellkite Charger as attackers.
2. Mobile Garrison and Hellkite Charger trigger.
3. Resolve the Mobile Garrison trigger, untapping Nyx Lotus.
4. Activate Nyx Lotus by tapping it, adding at least seven .
5. Resolve the Hellkite Charger trigger, causing you to pay 5 to untapping all attacking creatures you control and causing you to get an additional combat phase after this one.
6. Repeat each combat phase.