Deal combat damage to an opponent using the creature with Breath of Fury attached, triggering Breath of Fury and Sharding Sphinx.
Resolve the Sharding Sphinx trigger, creating a 1/1 Thopter artifact creature token.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the Thopter token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.

Infinite combat damage

Infinite combat phases

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite mana creatures you control can produce

Infinite creature sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Sharding Sphinx

Thopter Engineer

Roar of Resistance

Mass Hysteria

Urabrask the Hidden

Fervor

Combos with "Sharding Sphinx"