Betor, Kin to All, and Archfiend of Despair

Prerequisites

• Betor, Kin to All on the battlefield
• Archfiend of Despair on the battlefield
• undefined

Steps

1. At the beginning of your end step, Betor and Archfiend of Despair trigger
2. Resolve the Betor trigger, causing each opponent to half their life total, rounded up
3. Resolve the Archfiend of Despair trigger, causing each opponent to lose life equal to the life they've lost this turn

Results

• Infinite lifeloss