Bear Umbra + Hellkite Charger

RG identity

Commander legal

The 2 combo pieces

• Bear Umbra
• Hellkite Charger

What must be in place

Hellkite Charger does not have summoning sickness.
Bear Umbra attached to Hellkite Charger.
You control lands that can tap to produce at least {5}{R}{R}.
An opponent is unable to block and kill Hellkite Charger.

How to execute it

1. Declare Hellkite Charger as attacker.
2. Bear Umbra and Hellkite Charger triggers.
3. Resolve the Bear Umbra's trigger, untapping all lands you control.
4. Resolve the Hellkite Charger's trigger, choosing to pay {5}{R}{R} to untap all attacking creatures and to get an additional combat phase after this one.
5. Repeat.

What the combo produces

• Infinite combat phases