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