Defiling Daemogoth, and Aettir and Priwen

Prerequisites

• Defiling Daemogoth on the battlefield
• Aettir and Priwen on the battlefield

Steps

1. Deal combat damage using the creature with Aettir and Priwen attached, doubling your life total due to its lifelink
2. At the beginning of your end step, Defiling Daemogoth triggers, causing each opponent to lose life equal to the life you've lost this turn

Results

• Near-infinite lifegain
• Near-infinite lifeloss