Breath of Fury attached to any other creature you control that can attack this turn.
An opponent cannot block creatures you control.
Steps
Declare Two-Headed Hellkite and the creature with Breath of Fury attached as attackers.
Two-Headed Hellkite triggers, causing you to draw two cards.
The Locust God's first ability triggers twice, creating two 1/1 Insect creature tokens with flying and haste.
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 an Insect token, untap all creatures you control and get an additional combat phase after this one.
Repeat each combat phase.
Results
Infinite card draw.
Infinite draw triggers.
Near-infinite combat damage.
Near-infinite combat phases.
Near-infinite creature tokens with haste.
Near-infinite death triggers.
Near-infinite ETB.
Near-infinite LTB.
Near-infinite sacrifice triggers.
Near-infinite untap of creatures you control.
Near-infinite mana creatures you control can produce.