For newer players, what that means is that if you tap a Forest for a mana you can get another Green mana, but if you tap something like a Watery Grave for a Blue mana, you can also get one Black mana for free
Theres a ton of toughness, and that combos beautifully with all of our removal spells
It also has background, which means you can tap into white to take advantage of all the many other party and adventure cards in the color combination
Now many years later Pokemon is one of the largest franchises ever, making billions of dollars and launching more games/cards that we can keep up with
It might be an investment worth making if you know youre going in for that deck and youll always love it
As long as you avoid Rayquaza[Vivid Voltage], Path to the Peak, and a few other counter cards - this deck is fantastic