Breath of Fury attached to a creature without summoning sickness ).
Notable 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
Deal combat damage to an opponent using the nontoken creature that has haste and the creature that has
Breath of Fury attached.
Breath of Fury and
Impostor Syndrome trigger.
Resolve the
Impostor Syndrome trigger, creating a token copy of the nontoken creature with haste that isn't legendary.
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.
Repeat each combat phase.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite combat phases.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Infinite combat damage.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.