Squee, Dubious Monarch, Breath of Fury, and Goblin Warchief

Prerequisites

• Squee, Dubious Monarch on the battlefield
• Breath of Fury on the battlefield
• Goblin Warchief on the battlefield
• Breath of Fury attached to any other creature you control that does not have summoning sickness if it isn't a Goblin
• An opponent cannot block creatures you control

Steps

1. Declare Squee and the creature with Breath of Fury attached as attackers
2. Squee triggers, creating a 1/1 Goblin creature token that is tapped and attacking
3. Deal combat damage using the creature that has Breath of Fury attached
4. 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
5. Repeat each combat phase

Results

• 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