The cards in the decks arent exclusive and can be found in Whispers in the Well packs, so you dont need to buy these if you are just collecting
Emerald/Ruby is a control-style deck that has some strong advantages in multiplayer and does a great job stalling the Steel/Sapphire starter deck in particular
Its more so the fact that many of emeralds cards play better in conjunction with other inks, rather than with themselves
Shell set you back around $865 right now, but has sold for around $120 less than that
8 Fairy Godmother: Mystic Armorer 41/204, Amethyst Cinderella's magical benefactor gets a Legendary card with Fairy Godmother: Mystic Armorer, which shows her conjuring up a beautifully intricate sword
Always try to banish them in one turn, as they have the ability to heal or reduce your Strength values and keep their characters around