Declare Battle Cry Goblin, the creature with Breath of Fury attached, and any number of other creatures as attackers.
Battle Cry Goblin triggers, creating a 1/1 Goblin creature token that is tapped and attacking.
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 Goblin 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 ETB

Infinite LTB

Infinite mana creatures you control can produce

Infinite sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Battle Cry Goblin

Goblin Warchief

Goblin Chieftain

Declare the creature with Breath of Fury attached and Battle Cry Goblin as attackers. If needed, declare more creatures as attackers to ensure that the total power of attacking creatures is 6 or greater.
Battle Cry Goblin 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.

Fervor

Hellraiser Goblin

Roar of Resistance

Declare The Incredible Hulk and Battle Cry Goblin as attackers.
Battle Cry Goblin triggers, creating a creature token.
Holding priority, activate Goblin Bombardment by sacrificing a creature token, dealing 1 damage to The Incredible Hulk.
The Incredible Hulk triggers, putting a +1/+1 counter on it, then untapping it and causing you to get an additional combat phase after this one.
Repeat each combat phase.

Bruce Banner // The Incredible Hulk

Goblin Bombardment

Combos with "Battle Cry Goblin"