Shark Shredder, Killer Clone, Breath of Fury, and Mass Hysteria

Prerequisites

• Shark Shredder, Killer Clone on the battlefield
• Breath of Fury on the battlefield
• Mass Hysteria on the battlefield

Steps

1. Deal combat damage using Shark Shredder and the creature with Breath of Fury attached
2. Shark Shredder and Breath of Fury trigger
3. Resolve the Shark Shredder trigger, putting a creature card from the defending player's graveyard onto the battlefield under your control tapped and attacking
4. Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature put onto the battlefield in step 2, 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 ETB
• Infinite LTB
• Infinite combat damage
• Infinite combat phases
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control