Wildfire Eternal + Savage Beating + Helm of the Host + Izzet Chronarch

Wildfire Eternal

Savage Beating

Helm of the Host

Izzet Chronarch

How it works

1. At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Izzet Chronarch with haste.
2. When the token Izzet Chronarch enters the battlefield, it triggers, returning Savage Beating to your hand from your graveyard.
3. Declare Wildfire Eternal as an attacker.
4. When Wildfire Eternal is not blocked, it triggers, casting Savage Beating from your hand without paying its mana cost.
5. Resolve Savage Beating, causing you to untap all creatures you control and to get an additional combat phase after this one.
6. Repeat each combat phase.