Breath of Fury + Urabrask the Hidden + Myrel, Shield of Argive
Breath of Fury
Urabrask the Hidden
Myrel, Shield of Argive
Infinite combat damageInfinite combat phasesInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you controlInfinite creature tokens with haste
How it works
Declare the creature with Breath of Fury attached and Myrel as attackers.
Myrel triggers, creating a creature token.
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.