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The concept of Shining Pokmon was carried over to the e-Series in the form of Crystal Pokmon in the Aquapolis and Skyridge Expansions, although actual alternate color Pokmon would not be seen in the TCG again until EX Team Rocket Returns in the form of Pokmon Star

Of course, Voltron needs the Voltron Force (or the Paladins in the reboot) to pilot it

Simply put, it's because it doesn't add any restriction on how you can spend your mana

On top of that you are playing green and have access to things like Green Sun's Zenith or Worldly Tutor to get the right fighter for the situation and there is even more synergy from Neiyith of the Dire Hunt