Impostor Syndrome + Breath of Fury

Prerequisites

• You control a nontoken creature that has haste and that does not have Breath of Fury attached to it.
• An opponent cannot block creatures you control.

Steps

1. 1Deal combat damage to an opponent using the nontoken creature that has haste and the creature that has Breath of Fury attached.
2. 2Breath of Fury and Impostor Syndrome trigger.
3. 3Resolve the Impostor Syndrome trigger, creating a token copy of the nontoken creature with haste that isn't legendary.
4. 4Resolve the Breath of Fury trigger, sacrificing the creature it is attached to and attaching it to the creature token created in step 3, then untapping all creatures you control and causing you 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