Considering the fact that you're running high-costing dragons, the deck really needs to be using 40+ land, along with a few more ramp spells.

Adaptive Automaton: Giving your already large dragons +1/+1 seems kind of pointless.

Dragon Broodmother: Do you intend on having any of the tokens devour other creatures?

Dragon Egg and Dragon Hatchling: Both are very underwhelming dragons.

Mirror Entity: Considering that most of your dragons' power/toughness are fairly high, this card seems kind of pointless.

Skeletal Changeling: A 1/1 regenerating dragon is underwhelming, and though it's cute with Shapesharer, what are the odds of having both Shapesharer and this out?

Muse Vessel: I'm not sure what purpose this serves.

Mycosynth Wellspring: Seems kind of pointless if you have so few artifact sacrificing outlets.

Curse of Echoes: I'm not sure what purpose this serves.

Curse of Echoes was originally so I could counterspell counterspells but I took it out as soon as I got more dragon related spells.

Muse Vessel is so I can make opponents discard and (since I am 5 color here) I can almost always cast whatever they discard.

Skeletal Changeling is a blocker when I have no mana for dragons (yet).

That's true about Muse Vessel, but odds are they'll choose to exile cards that don't really help you much.

Nice deck. I'd recommend Bower Passage over Forgestoker Dragon . Since you've likely got a lot of attacking dragons at any given time, I'd also recommend Utvara Hellkite . It's actually very effective.

Lol, never saw Bower Passage before. Gonna buy 4 for my other decks. Wish I had that when I was running Animar/Infect.

How Infinite Reflection work on kilnmouth? Just for the other creatures entering in play? Actually works better on Scourge of Valkas in my opinion.

If i have a handful of dragons, each one i play has a ton of tokens. Works with the scourge and the Utvara Hellkite and Progenitor Mimic also. but i love having multiple tap for 12 - 15 creatures on the board

A kicked Rite of Replication on Scourge of Valkas is 180 direct damage (6 dragons X 6 valkus X 5 ETB triggers =180 ifin valkus is the only dragon in play at the time the more dragons you have out the higher the first number in the equation) Splinter Twin is epic on valkas or utvara combo that with Intruder Alarm and valkas kills EVERYTHING on the table plus everyone at the next table over playing another game and the nerds playing warhammer in the back of the shop, yep killed them too (yes he is that badass!) I mean by the time you put out your 1,000th scourge of valkas dealing 1,000 damage each the nerds in the back of the shop will be burning corpses lol Dragon Tyrant is good for getting in 12 commander damage without pumps 5 red mana and that's 22 commander damage for the win, just my thoughts though. Check out my deck A Dragon by any other name for mor ideas I've not lost a game yet with it and the local judge has told me he will never play it ever again unless we have a EDH tournament and we are pared up then he will scoop. +1 for dragon awesomeness (please return the favor thanks)

Oh I got so wrapped up in combos I forgot Channel the Suns and Crystal Quarry both make it easier to cast scion or bringers and with all the lands you have ETB tapped a Amulet of Vigor may be in order

The Dragon Tyrant and Splinter Twin are just too pricey. I had taken Rite of Replication out and replaced it with Call to the Kindred before i had a Scourge of Valkas . The Call doesn't seem to perform very well though so I will take your advice and put the Rite back in. The math with that combo reminds me of the Mana Echoes + (insert token generator here) lunacy i use in my Gruul deck on a good day. I think our communal card stash has a Crystal Quarry also. I will take one out. Thanks.

Mana or money? I just recently picked up one of each for $3 and $10 respectfully hmmmmmm.... Ok just checked yep dragon tyrant is $2.50-$3 but damn splinter twin is $16 for heavy played ok yea I can see that being to pricy but not tyrant. However if your talking mana wise your never going to cast or have tyrant in play during your upkeep (he is just to grab with scion for 2 and swing with 6/6 + doublestrike pumpable commander damage hopefully for the win) but yet again that's just my thought on the matter

wow I have never thought about adding Rite of Replication to my Scion deck! that is a great idea! Thanks. I am wondering how do you get your dragons back from the yard? or do you just hard cast most of them and turn Scion into dragons you need at the moment? I am also wondering why are you using the bringers in your deck?

One card i would suggest putting in your deck is Tempt with Discovery ! this card is awesome in multi player because everyone will want to get a free land and then you will get to put in like 4 or 5 lands.

I usually hard cast the dragons except for Nicol Bolas or Balefire Dragon for wiping out a side. I keep my boss as a threat unless there is a good reason to shapeshift him. The bringers are COOL. They all help out also, i mean, draw extra cards, take opponents creatures, get free beasts etc. is really good for 5 mana. Ordering a Draco so i can change into a big hitter and putting in my Vampiric Dragon so i can change and kill 3 or 4 weenie creatures for a few +1 counters.

Well, it depend from the meta, but is not easy to find so many x/1 creature to kill with Vampiric Dragon .Btw, I usually love the combo Draco + Spellbound Dragon or Hoard-Smelter Dragon

I'd Definitely put in the Dragonlords. Also Dragon Tempest acts as a better Scourge of Valkas, giving all of your fliers haste and making it so that whenever a dragon hits the battlefield, you can ping face or a creature. Depending on what kind of Scion deck you're going for, reanimation should be the sole theme or not at all in. Also anything that has an enter the battlefield effect is kinda null with scion, since they aren't entering the battlefield, ie Malfegor. Karrthus, Tyrant of Jund is key for winning back your dragons if your stuff gets stolen, and he's the only exception I'd make to my previous rule. Crosis, the Purger is good for stealing stuff from graveyards. Dragon Arch is an absolute monster in a Scion deck, seeing as most of your dragons are going to be either mono-red or multicolored, with the exception of the Dragon Spirits from Kamigawa. Speaking of which, Yosei, Kokusho, and Ryusei are all really good for cheap dragons with awesome abilities.

As for lands, I'd make your mana base similar to mine, with one of each basic, a single Cultivate to tutor for two of the five, all ten of the check lands, all ten of the shocks, all ten of the tri-lands, and all five vivids. You seem to be on the right track, but your lands almost all come in tapped, and that can be a hindrance. I tried the panorama's and they do nothing for the deck.

Finally, I'd do board wipes and kill spells. Path to Exile, Swords to Plowshares, Wrath of God, Supreme Verdict, etc. just to to ensure that the board state doesn't get wrecked in your opponents favor in the early game before you have your dragons.

As some last suggestions, Birds of Paradise, Balefire Dragon, either Dragonspeaker Shaman or Dragonlord's Servant, and World at War.

My deck is Big Dumb Dragons EDH. It plays well in my local playgroup for both single and multiplayer.

Some of your suggestions are cards i have but i need more of as they are in other decks (especially i need land upgrades).

I took out all boardwipes but one from every deck i own pretty much. We had so many boardwipes in a normal 4 player game that it was just stupid.

Karrthus, Tyrant of Jund is just too expensive and i think you mixed up Crosis, the Purger with Teneb, the Harvester.

Great suggestions, thanks.