Rionya, Fire Dancer + Reckless Barbarian + Hellkite Charger

Rionya, Fire Dancer

Reckless Barbarian

Hellkite Charger

How it works

1. At the beginning of your combat phase, Rionya triggers, creating at least four copies of Reckless Barbarian with haste.
2. Declare Hellkite Charger as an attacker, attacking an opponent unable to block and kill it, triggering its ability.
3. Holding priority, activate four Reckless Barbarian tokens by sacrificing them, adding eight .
4. Resolve the Hellkite Charger ability, causing you to pay 5 to untap all attacking creatures and to get an additional combat phase after this one.
5. Repeat.