Breath of Fury + Sun-Blessed Guardian // Furnace-Blessed Conqueror + Hammer of Purphoros

How it works

Declare the creature with Breath of Fury attached and Sun-Blessed Guardian // Furnace-Blessed Conqueror as attackers.
Sun-Blessed Guardian // Furnace-Blessed Conqueror triggers, creating a creature token.
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.