Rionya, Fire Dancer + Reckless Barbarian + Aggravated Assault

Rionya, Fire Dancer

Reckless Barbarian

Aggravated Assault

How it works

1. At the beginning of your combat phase, Rionya triggers, creating at least three copies of Reckless Barbarian with haste.
2. Move to your postcombat main phase.
3. Activate three Reckless Barbarian tokens by sacrificing them, adding six .
4. Activate Aggravated Assault by paying 3, untap all attacking creatures and getting an additional combat phase and main phase after this phase.
5. Repeat.