Activate Vizkopa Guildmage's second ability by paying ({1} magic symbol) ({W} magic symbol) ({B} magic symbol) , causing each opponent to lose life whenever you gain life this turn.
Activate Cavern Harpy by paying 1 life.
Repeat step 2 until you have one life.
Activate Children of Korils by sacrificing it, causing you to gain life equal to the amount of life you've lost this turn.
Vizkopa Guildmage triggers, causing each opponent to lose life equal to the amount of life you gained.
Each opponent loses the game due to having zero or less life.