Why is this script not changing the players team?

while wait() do
	local Players = game.Players:GetPlayers()
	local MonsterKing = Players[math.random(1, #Players)]
	if MonsterKing.name == not game.ServerStorage.LastMonsterKing.Value then
		game.Players[MonsterKing.name].Team = game.Teams["Monster King"]
		game.ServerStorage.LastMonsterKing.Value = MonsterKing.name
		break
	end
end

I'm trying to make it so that my game will randomly choose a player to be the monster king while making it so they were not the monster king last time.