If you want mana, Green will give it to you. Since the beginning, there have been Llanowar Elves and Wild Growths, and some where along the lines, Fertile Ground got thrown in, allowing you to generate any color mana you wanted. The advent of Quirion Elves did the same thing for elves that the Fertile Ground did for lands, more or less. Later on, Skyshroud Elves and Urborg Elves were introduced, allowing you to basically get any and every color mana you wanted.
The Invasion Block, with it's emphasis on 3-, 4-, and 5-Color decks saw Green's mana production really shine - if you wanted mana, regardless of color, you played Green in your deck. With cards like Overlaid Terrain and Pulse of Llanowar, Color conflicts are not a problem.
For really sick mana in a Mono-Green deck, play Vernal Blood (3G) and Rofellos, Llanowar Emmisary (GG). You can only play one Rofellos, since he's a legend, but if you have him and 4 of the Blooms out, you can get some FIVE GREEN MANA for every forest you control. Green can be powerful, in it's own right.
It's True
The Invasion Block, with it's emphasis on 3-, 4-, and 5-Color decks saw Green's mana production really shine - if you wanted mana, regardless of color, you played Green in your deck. With cards like Overlaid Terrain and Pulse of Llanowar, Color conflicts are not a problem.
For really sick mana in a Mono-Green deck, play Vernal Blood (3G) and Rofellos, Llanowar Emmisary (GG). You can only play one Rofellos, since he's a legend, but if you have him and 4 of the Blooms out, you can get some FIVE GREEN MANA for every forest you control. Green can be powerful, in it's own right.