Red.Deck.Wins

Eidolon is so strong because it will hurt my opponent more than it will hurt me. I may take ten from it but if they take six I wouldve burn them for at least an additional ten...
also fetches thin my deck, while playing burn i never want to draw into a land so i try to get rid of them with fetches while still having a consistent land drop

Ummm... I don't think you know what you're talking about. No offense, but you should really keep it mono red, like most burn decks. It seems pretty sub-par compared to some burn decks you could make. Drawing fetch lands is still drawing into lands, and they burn you when they come in. Adds a lot to the price too. The Eidolon doesn't work very well, either, because if you are the only person playing small spells, you get kinda screwed. And what's the point of the Goblin Guide?

I'll start by saying I've been playing burn at a competitive level for 3 years or so now. My following advise is based on this passed experience.
@ Padfoot8181 you are wrong and are giving bad advise. (This is not meant to be an insult just honesty).
Eidolon is amazing and is played in almost all competitive modern and legacy burn decks. 90% of all decks in modern are made up of primarily 3cmc or less spells. If your opponents deck isn't then they wont be able to out race this in the majority of match ups anyway.
As well the fetch lands greatly help in thinning as well as grabbing the green source for the Atarka's Command which again is being played in most creature based burn decks at pro level. As well as the white source for Boros Charm which again is a great aspect of the build.
@ Thatch what I don't like in this build is Shard Volley, Having such few lands means you most likely wont want to sacrifice any at the time casting it. I would suggest cutting them and playing Grim Lavamancer as a 3 of and adding the 4th Boros Charm. Grim will make use of those fetches in your grave Boros Charm because well it's that good. If your not a fan of the Lavamancer Wild Nacatl is another great option which will take this into the realm of being a Zoo build.
As for your Sideboard I don't think Searing blaze warrants a spot since it's not a card in which you would bring in against any particular arch type deck. I'd suggest adding 2x Dragon's Claw for the mirror match and 2x Exquisite Firecraft to bring in against control. Also 4 Destructive Revelries is too much. 2 copies of Torpor Orb really benefits this build against many match ups. I hoses Snapcaster, Aristocrats decks, Elves and Soul Sisters to name a few off the top of my head. Not to mention it takes the opponents choice to choose whether or not Vexing Devil stays on the field.
In conclusion these are just my opinions and should be taken as such. Happy Casting. :)

I have also been playing for just over three years, and I wasn't trying to be mean, I just didn't understand why he had those in there.

I don't think you were being mean just that you were giving poor advise without actually knowing that you were. As I stated the fetches are required not only for the thinning aspect but to consistently have access to green and white on turn 2. Another great way to think about Eidolon is the amount of value you get from it. Playing it on turn 2 or 3 either slows down your opponents own plan by making them use a critical turn 3 or 4 turn dealing with it or punishes them the whole time for not dealing with it. It falls so well into the ideology of the burn mentality of "It doesn't matter if you have 1 life if your opponent has 0" not to be played.
Again just my opinion which I happen to know is shared by many others.

Wow, looked at the notification on the site and reread my comment. Lol, I was so ignorant back then. That comment was made when I was pretty new to Magic and was a strictly casual player and didn't understand the value of Eidolon or fetch lands. I must have looked like such an idiot.

I wouldn't go as far as thinking you were an idiot. Just unaware. An idiot would have argued their point of view over clear reasoning and sense.