Although they share the same name, there isn't a clear reason to have all the Madrigals together in the same deck, except for 004-018
When it comes to the gameplay, the Ruby cards have an aggressive style of play with glimmers that have good overall stats, on the higher end of Strength and Willpower, as well as traits or abilities that will force action onto the player or their opponent
Princesses work together to get Lore, and they can do so in a surprisingly aggressive manner
Thats a powerful ability that will likely cause this Magica De Spell card to see play in most Amethyst decks (assuming discard remains a popular strategy after set five)
With the exception of a single copy of Kronk, Junion Chipmunk, this deck caps out at four ink-cost cards, which means it's meant to be played with a small inkwell
This means you can play a Goat for free, gain a lore, run it into an opposing character, and gain another lore