Breath of Fury + Tana, the Bloodsower + Frostcliff Siege
Breath of Fury
Tana, the Bloodsower
Frostcliff Siege
Infinite creature ETBInfinite creature LTBInfinite combat damageInfinite combat phasesInfinite creature tokens with hasteInfinite death triggersInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Deal combat damage using the creature that has Breath of Fury attached and Tana, triggering Breath of Fury and Tana.
Resolve the Tana trigger, creating at least one 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.