Breath of Fury, Harnessed Snubhorn, Encroaching Mycosynth, Sculpting Steel, and Urabrask the Hidden

Prerequisites

• Breath of Fury on the battlefield
• Harnessed Snubhorn on the battlefield
• Encroaching Mycosynth on the battlefield
• Sculpting Steel in the graveyard
• Urabrask the Hidden on the battlefield
• Breath of Fury attached to Harnessed Snubhorn
• An opponent cannot block and kill creatures you control

Steps

1. Deal combat damage to an opponent using Harnessed Snubhorn, triggering it and Breath of Fury
2. Resolve the Harnessed Snubhorn trigger, returning Sculpting Steel from your graveyard to the battlefield as a copy of Harnessed Snubhorn
3. Resolve the Breath of Fury trigger, causing you to sacrifice Harnessed Snubhorn, then attach Breath of Fury to Sculpting Steel, then causing you to untap all creatures you control and to get an additional combat phase after this one
4. Move to your next combat phase
5. Deal combat damage to an opponent using Sculpting Steel, triggering it and Breath of Fury
6. Resolve the Sculpting Steel trigger, returning Harnessed Snubhorn from your graveyard to the battlefield
7. Resolve the Breath of Fury trigger, causing you to sacrifice Sculpting Steel, then attach Breath of Fury to Harnessed Snubhorn, then causing you to untap all creatures you control and to get an additional combat phase after this one
8. Move to your next combat phase
9. Repeat

Results

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