Welcome to the Three-Colour Guild Peasant Cube!
As the name implies the cube has two main traits. To begin with it's a peasant cube, meaning that only cards ever printed in paper as common or uncommon are allowed. Secondly, the cube is constructed in such a way that each shard/wedge has a theme, meaning that any colour combination within such a shard or wedge will tend to be slanted towards that gameplay, thus giving the cube its name.
I have chosen to not include cards that technically are common or uncommon but don't feel like they are, such as Force of Will, Sinkhole and Demonic Tutor. Other cards have been chosen to not be included by nature of being too efficient for the overall speed of the cube. This includes cards like Lightning Bolt, Path to Exile and Dark Ritual.
In addition, when choosing between two options for the cube, I have tended towards the option that a) has fewer coloured "pips" in the casting cost - especially for low mana costs - and b) fit into more than one strategy. In general I have tried to limit the number of "autopicks" and instead focus on synnergy. That said, for some of the archetypes it is easier to find cards that fit into multiple archetypes than it is for other archetypes.
Due to the nature of peasant cubes, all nonbasic lands in the cube enter tapped which naturally has an effect on how reliable two colour aggro decks can be. This is why the creature curve mostly starts at two. Aggro is still supported, but it's more slanted towards midrange.
So without further ado, let's take a look at the three-colour guilds.