Olivia, Crimson Bride, and Breath of Fury

Prerequisites

• Olivia, Crimson Bride on the battlefield
• Breath of Fury on the battlefield
• Breath of Fury attached to another nontoken creature you control that has haste
• You have at least one creature card in your graveyard that has haste
• An opponent cannot block creatures you control

Steps

1. Declare Olivia and the creature with Breath of Fury attached as attackers
2. Olivia triggers, returning a creature card that has haste from your graveyard to the battlefield tapped and attacking
3. Deal combat damage using the creature that has Breath of Fury attached
4. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature Olivia returned, then causing you to untap all creatures you control and to get an additional combat phase after this one
5. Repeat each combat phase

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