Ha! Let's set the bar higher now.
Six phases anyone? That'd be cool!
PS. I'll add a further, "reasonableness" constraint to the problem definition: Let's stick to a system that is Liquid at reasonable T & P conditions. Say, 1 atm pressure and somewhere between 10°C to 60°C (secretly, because I think molten metallic alloy systems might be numerous that are multiphasic at, high T)