Impostor Syndrome
Breath of Fury

   Prerequisites

What do I need to start this combo?
Impostor Syndrome and Breath of Fury on the battlefield (Breath of Fury attached to a creature without summoning sickness on the battlefield).
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

How does this combo work?
1
Deal combat damage to an opponent using the nontoken creature that has haste and the creature that has Breath of Fury attached.
2
Breath of Fury and Impostor Syndrome trigger.
3
Resolve the Impostor Syndrome trigger, creating a token copy of the nontoken creature with haste that isn't legendary.
4
Resolve 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
Repeat each combat phase.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite combat phases
Infinite untap of creatures you control
Infinite mana creatures you control can produce
Infinite combat damage
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