Just wanted to say thatI really like the way that you modified this deck. I bought a ton of scars artifacts on mtgo to try out different color combos for the splintertwin trick and I ended up coming back down to this white aggro. I was really hanging on to the myr galvinizer/battlesphere because it should be cool in theory but I let it go. Here is what I am running for skirmishes (I don't run the sideboard, it is thrown together) http://www.mtgvault.com/EditDeck.aspx?DeckID=117066&DeckCardID=2478843 Machete is great for when the tempered steel isn't dropping and easily creates myr. Not certain about pilgrim's eye but helps to get things moving if I am short on plains.
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I am starting to think that U/R is the way to go if you want to do the splinter twin combo and white should just be mono aggro with tempered steel etc. I would drop the whispersilk cloak since it is kinda slow and you won't be able to equip it the same turn you get your galvanizer out most likely. maybe just throw in some mana leaks and drop the myrsmith for dispel or something similar and cheap. I dunno where you would make room for comet storm other than shaving off the tops of a few. . . oh yeah and definitely perilous myr instead of ichorclaw.
Any thoughts on adding some steel overseer? That is my goal for my white/artifact aggro deck since I already have two of him and 2 angels. I am not sure what I would drop, maybe the juggernaut a myrsmith a condemn and a gold myr (or maybe two gold myr since you aren't playing with the galvanizer)