Aggravated Assault, and Bear Umbra

Prerequisites

• Aggravated Assault on the battlefield
• Bear Umbra on the battlefield
• undefined

Steps

1. Declare enchanted creature as attacker
2. Bear Umbra triggers, untapping all lands you control
3. Proceed to your next main phase
4. Activate Aggravated Assault by paying , untapping all creatures you control and getting an additional combat and main phase after this one
5. Repeat

Results

• Infinite combat phases