This is a cube in which every card in the cube is part of a cycle. From the classic horizontal cycles in which a theme is shared across each color. To vertical cycles in which a theme is shared across rarities in the same color. As well as two-card cycles or pairs in which a theme is mirrored across two colors in separate cards. As well as mega-cycles in which a theme is completed across multiple sets.

If you are curious about which cycle a card is from refer to the primer from this Moxfield package of the cube:

https://www.moxfield.com/decks/_U2RuzneL0moZEg3FV-MoQ

I have no idea if this cube is balanced. I thought it was a cool idea.