Disa the Restless + Breath of Fury + Nahiri's Resolve
Disa the Restless
Breath of Fury
Nahiri's Resolve
Infinite creature ETBInfinite creature LTBInfinite combat damageInfinite combat phasesInfinite death triggersInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Deal combat damage to an opponent using the creature that has Breath of Fury attached, triggering Breath of Fury and Disa the Restless's second ability.
Resolve the Disa the Restless trigger, creating a Tarmogoyf creature token.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to and attach it to the Tarmogoyf token, then causing untap all creatures you control and to get an additional combat phase after this one.