Fire Lord Zuko + Hellkite Charger

Prerequisites

An opponent cannot block and kill Hellkite Charger or Fire Lord Zuko.

Steps

1. Declare Hellkite Charger and Fire Lord Zuko as attackers, triggering their abilities.
2. Resolve the Fire Lord Zuko trigger, adding an amount of {R} equal to its power.
3. Resolve the Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures and to get an additional combat phase after this one.
4. Repeat each combat phase.