At the beginning of each opponent's upkeep, Havoc Festival triggers, causing them to lose half their life total, rounded up.
At the beginning of their end step, Wound Reflection triggers, causing each opponent to lose life equal to the life they lost this turn.
The opponent whose turn it is loses the game due to having zero or less life.
Repeat during each other opponent's turn.

Each opponent loses the game

Near-infinite lifeloss

Havoc Festival

Wound Reflection

At the beginning of each opponent's upkeep, Havoc Festival triggers, causing them to lose half their life total, rounded up.
At the beginning of their end step, Archfiend of Despair triggers, causing each opponent to lose life equal to the life they lost this turn.
The opponent whose turn it is loses the game due to having zero or less life.
Repeat during each other opponent's turn.

Combos with "Havoc Festival"