ceefu

try siege rhino. It works wonders in standard.

colossal might is a little more versatile because you can play it anytime whereas the rampager is only on attacking creatures and the on point of toughness isnt as important

Temur battle rage over double cleave? Also maybe become immense because it works well with the evolving wilds?

Made some edits thx for the advice. Any decks of yours you want me to look at?

May I suggest Machinate?

welding jar is funny for 0 mana
pretty awesome deck though. one like from me
unfortunately I cannot make this deck as all of my friends play hellkite tyrant.

right i looked again and it is much more stable than I originally saw it

haha didnt realize you username was lolz. thats ironic...

already did

you can also look at some of the newer cards with dash like mardu scout to replace a couple of the hellspark elementals just because it is recurring.

a better manifest engine would be write into being just so you arent relying on the one card you manifest to be emrakul because it is very rare that you are able to manifest that exact card and with only 8 chances you might run out of manifest cards before manifesting a emrakul. just a thought.

here is a list that was played by one of the people on commander versus for star city games.
It uses cromat as commander though has the same walker strategy and makes me just wish I was stupid rich enough to buy it. hope you enjoy and nice list btw 1 like from me!
http://www.mtgvault.com/ceefu/decks/scg-cromat-edh/
lol

vaultbreaker is also a solid dash card. I would also drop a collateral damage for another mardu scout. the collateral damage is one time and instant though the scout is re-usable though at sorcery which seems better. Also scout does more with the ascendancy and with siege that c-damage does.

with a curve like that you can probably drop a land. Maybe add another grand master or another collateral damage.

jeeze never seen this before this is crazy. Nice find. +1 from me

just for lolz play blasphemous act

you say its casual which means that banned cards are allowed so play treasure cruise

Okay I have a really good friend that this is his deck. I have many suggestions ready for you here I go:

Add blue:
Ornithopter+Ensoul Artifact
Ensoul Artifact+Darksteel citadel

Use cards like:
Generator servant:
-works well with Doom Engine

Springleaf Drum
-Works with ornithopter to make tons of early mana

Chief engineer can be a useful interaction when you have free creatures like ornithopter

Magma jet is decent to set things up

Lightning strike for some removal

one or two ugins nexus can also be cool because you can sac it with shrapnel blast for five damage and a extra turn

Also maybe Renowned weaponsmith could help you get to the doom engine faster.

so overall add:
4 ornithopter
4 darksteel citadel
4 ensoul artifact
3-4 springleaf drum
3-4 generator servant
1-3 chief engineer
3-4 Magma Jet
2-3 Lightning strike
1-2 Ugins Nexus
2-3 Renowned Weaponsmith

Okay I like your first suggestion and I agree that Mastery is better in limited and I first made this deck after prerelease for FRF in which I got two of those and they were AWESOME so my vision was a little clouded on that card but I have now dropped it down to a one-of in favor of a cloudform(I think Lifelink seems a little better than Hexproof) and another write into being.

Let me just clear up the second suggestion though, you want me to put in banishing light instead of Ethereal Ambush? You said that The mana cost was higher but something about it trading with manifest creatures I don't understand. I'm sure your logic was completely stable I just don;t understand the way you put it into words.
Thanks for the help though I really appreciate it.

Some interesting combos:
with Ensoul artifact:
-darksteel citadel
-ornithopter

with fling:
-scuttling doom engine

with shrapnel blast:
-Doom engine
-Ugins nexus

just some interesting suggestions im only thinking of standard cards im sure there are other options too when you get out of the strict format. My friend plays a standard deck though and it has a strategy somewhat like this and it works well with those combos.