Squee, Dubious Monarch + Breath of Fury + Goblin Chieftain

Prerequisites

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

Effects

• Infinite combat damage
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control