Skirk Fire Marshal + The Wanderer + Triumph of the Hordes
Skirk Fire Marshal
The Wanderer
Triumph of the Hordes
Each opponent loses the game
How it works
Cast Triumph of the Hordes by paying 2, giving creatures you control +1/+1 and infect until end of turn.
Activate Skirk Fire Marshal by tapping five Goblins you control, putting ten -1/-1 counters on each creature opponents control and giving each opponent ten poison counters.
Each opponent loses the game due to having ten poison counters.