Breath of Fury + Ogre Chitterlord + Maelstrom Wanderer
Breath of Fury
Ogre Chitterlord
Maelstrom Wanderer
Infinite combat phasesInfinitely powerful Rats you control until end of turnInfinite creature ETBInfinite creature LTBInfinite combat damageInfinite creature tokens with hasteInfinite death triggersInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Declare the creature with Breath of Fury attached and Ogre Chitterlord as attackers.
Ogre Chitterlord triggers, creating two creature tokens.
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 a creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.