Hive Mind + Enter the Infinite + Underworld Dreams
Hive Mind
Enter the Infinite
Underworld Dreams
Each opponent loses the gameInfinite card draw for all playersInfinite draw triggers for all playersNear-infinite damage
How it works
Cast Enter the Infinite by paying 8.
Hive Mind triggers, causing each opponent to copy Enter the Infinite.
Resolve the first opponent's Enter the Infinite, causing the opponent to draw cards equal to their deck size, and then put a card on top of their library.
Underworld Dreams triggers for each card the opponent draws this way, dealing 1 damage to them for each card drawn.
The opponent loses the game due to having zero or less life.