This lethal sequence relies on deliberately paying a massive amount of life into Toxic Deluge to shrink the board, immediately capitalizing on that self-inflicted loss with Children of Korlis to claw all that life right back in a single chunk. Because you've pre-fueled the second ability of Vizkopa Guildmage, that sudden surge of life triggers a massive drain that strips your opponents of their life totals all at once. It's a remarkably compact and brutal conversion, turning your own near-death experience into an instant-win blow against the entire table.