But there is a known set sequence, which you can find on Bulbapedia: The Japanese release are ordered by the types first, then ascending rarity (Rare and Rare Holo are considered the same), then National Pokdex number, followed by Trainer and Energy cards
You can obtain the Alolan Ninetales (3-Diamonds rarity) card by opening Celestial Guardians: Lunala from Celestial Guardians set
That's a powerful way to ramp up your mana base with some mana-producing artifacts, or you could just have two Darksteel Colossuses bouncing around
What theme each booster contains is randomized, but each themed 20 cards will be sealed inside the pack and labled
More Liquid for Smaller Buyers : Easier to sell or trade since more people can afford it, reducing holding time
Let me know on Twitter what you think to continue the discussion