They act as an Evolving Wilds for specific color trios, and tap for mana in the interim
Then two years later, we made a blue version of Kindle called Accumulated Knowledge: I would revisit this yet again in Odyssey with a cycle of cards called the Bursts
While you could lean into artifact themes to exploit the first ability, the second ability is more than enough with making clues cost only one mana to cash in
Its the Shining treatment itself: in the Neo era, Shining Pokmon were used to represent alternate-colored (shiny) Pokmon , and Neo Destinys Shining cards used a reflective foil effect that makes the Pokmon literally shine. Neo Destiny Shining Pokmon also had a unique rarity symbol (three stars) that was never reused in the same way later
But if you want to try out the Berserker tribal, then go for Rakdos (red-black) list with Quakebringer
The First Chapters boosters had a Sapphire Maleficent with a blue cloud, Elsa was Amethyst, Mickey was Ruby