There are two mountains, and I added them if I wanted to substitute cards from my sideboard, which require red mana. I have multiple mana sources, but since the majority of spells require colorless mana it doesn't matter. As for your suggestion,
glimmervoid is rather expensive, true, if you wanted to switch it with something else that's works, sure. I could have
gone with
city of brass, which would have been cheaper, but like I said, I'm running three mana sources. The purpose of the deck is to utilise counters, using a land that doubles as a creature defeats the premise. But, thanks for the suggestion.