Breath of Fury + Urabrask the Hidden + Battle Cry Goblin
Breath of Fury
Urabrask the Hidden
Battle Cry Goblin
Infinite combat damageInfinite combat phasesInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite 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 Battle Cry Goblin as attackers. If needed, declare more creatures as attackers to ensure that the total power of attacking creatures is 6 or greater.
Battle Cry Goblin 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.
Repeat each combat phase.
This vicious loop transforms a standard combat step into an endless sequence of assaults by attaching Breath of Fury to a designated attacker and letting it deal combat damage to a player. The resulting trigger forces you to sacrifice that creature while seamlessly migrating the Aura onto a fresh body—in this case, the attacking Goblin token generated by Battle Cry Goblin's pack tactics ability. Because Urabrask the Hidden ensures that all your creatures naturally enter the battlefield ready to strike with haste, every untap of your board resets your army immediately for the next extra combat phase.