Breath of Fury + Origin of the Hidden Ones + Urabrask the Hidden

Prerequisites

• Origin of the Hidden Ones has exactly two lore counters on it.
• You control at least one Assassin that does not have summoning sickness.
• An opponent cannot block creatures you control.

Steps

1. 1At the beginning of your precombat main phase, Origin of the Hidden Ones triggers, putting a lore counter on it.
2. 2Origin of the Hidden Ones' third chapter ability triggers, causing you to create an Assassin token whenever an Assassin attacks this turn and sacrifice Origin of the Hidden Ones.
3. 3Declare the creature with Breath of Fury attached, and at least one Assassin if the creature with Breath of Fury attached isn't an Assassin, as attackers.
4. 4Origin of the Hidden Ones triggers, creating a 1/1 Assassin creature token that's tapped and attacking.
5. 5Deal combat damage using the creature that has Breath of Fury attached.
6. 6Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the Assassin token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
7. 7Repeat from step 3 each combat phase.

Effects

• Infinite combat damage
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control