Breath of Fury, Dune-Brood Nephilim, and Urabrask the Hidden

Prerequisites

• Breath of Fury on the battlefield
• Dune-Brood Nephilim on the battlefield
• Urabrask the Hidden on the battlefield
• Breath of Fury attached to another creature you control
• An opponent cannot block creatures you control
• You control a land

Steps

1. Deal combat damage to an opponent using Dune-Brood Nephilim and the creature with Breath of Fury attached
2. Breath of Fury and Dune-Brood Nephilim trigger
3. Resolve the Dune-Brood Nephilim trigger, creating a 1/1 Sand creature token for each land you control
4. Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to a Sand token, untap all creatures you control and get an additional combat phase after this one
5. Repeat each combat phase

Results

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