You are not supposed to get all mana types. Having only access to only some specific mana makes the games feel more different. As Amurites you already start with an additional mana type. You can build mana vaults or find unique improvements, that can give additional. With the extra starting mana, you could easily get a different types of mana as Amurites. You can take a look at the first two screenshots, to see what kind of improvement and building I mean. It's a city building. Take a look at one of my screenshots. Maybe it's bugged? Take a look at one of my screenshots, to see, how it should look.