Celes, Rune Knight, Breath of Fury, Thunderblust, and Rattleblaze Scarecrow

Prerequisites

• Celes, Rune Knight on the battlefield
• Breath of Fury on the battlefield
• Thunderblust on the battlefield
• Rattleblaze Scarecrow on the battlefield

Steps

1. Deal combat damage using the persist creature that has Breath of Fury attached
2. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the other persist creature, then causing you to untap all creatures you control and to get an additional combat phase after this one
3. When the sacrificed creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. When the creature enters, Celes's second ability triggers, putting a +1/+1 counter on each creature you control
5. Repeat each combat phase

Results

• Infinite +1/+1 counters on creatures you control
• 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