Harmonic Prodigy + Dire Fleet Ravager + Archfiend of Despair

Harmonic Prodigy

Dire Fleet Ravager

Archfiend of Despair

How it works

1. Cast Dire Fleet Ravager by paying 3.
2. Dire Fleet Ravager enters the battlefield, triggering its ability twice.
3. Resolve the first Dire Fleet Ravager trigger, causing each player to lose a third of their life total, rounded up.
4. Resolve the second Dire Fleet Ravager trigger, causing each player to lose a third of their life total, rounded up.
5. At the beginning of your end step, Archfiend of Despair triggers, causing each opponent to lose life equal to the life they lost this turn.
6. Each opponent loses the game due to having zero or less life.