White is not one of the main flash colors, but all colors have access to it if they need it mechanically (usually because they have an enters-the-battlefield trigger that needs to happen on the opponent's turn)
And not only does it offer the "rookie cards" of favorites like Lugia, Typhlosion, Feraligatr, and Meganium, the 2000 Pokmon Neo Genesis 1st Edition series was also the first to showcase Baby Pokmon cards
Card Errata Before After Errata Notes Read as the errata when playing
But sometimes you don't need the mana right away, and you'd rather get some sort of bonus from the land you grab
What really makes an Edgar Markov deck pop, though, is if you play him with mass land destruction, such as Ravages of War or Armageddon, resetting the board on turn four, while everyone else is trying to set themselves up with extra lands