Cacophodon, and Illusionist's Bracers

Prerequisites

• Cacophodon on the battlefield
• Illusionist's Bracers on the battlefield

Steps

1. Activate the creature hat can deal damage by tapping it, targeting Cacophodon
2. Illusionist's Bracers triggers, copying the creature's ability, targeting any applicable target
3. Resolve the creature's ability, dealing 1 damage to any target and then dealing 1 damage to Cacophodon
4. Cacophodon triggers, untapping the creature that deals damage
5. Repeat

Results

• Infinite damage
• Infinite mana permanents you control can produce
• Infinite untap of permanents you control