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I'd been tinkering with something like this a bit myself, except that I went super aggro with it. Playset of each Illusion, playsets of Lord of the Unreal and Grand Architect , playset of Phyrexian Metamorph (because 4 extra Lords that protect and pump themselves clearly isn't enough). Planeswalkers, especially 5cc ones like Gideon and Jace 3.0 feel like they'd be really slow for what you're trying to do with Illusions. Also liked Swiftfoot Boots. That and the Metamorphs give something for the Architects to power out, and the boots protect your original Lord if you're not drawing an Image to copy it. Hope that wasn't too control-freakish.
Because your deck is aggro, not control. A splash of white for these 3 cards is really pointless, when you would be far better off as a mono color using counterspells such as Mana Leak , Cancel , and Spell Pierce which wouldn't give them a chance to play whatever it is you're trying to stop by using white, and wouldn't give you any possibility of hosing yourself out of a color with poor deck luck. If you really must splash white, use better cards like Oblivion Ring and Divine Offering to control well, whatever you want, and artifacts, and consider using Gideon Jura as well for creature control.
What you really need to do, is make better use of your Grand Architect (he does give your blue creatures +1/+1, which is decent) by throwing in some Wurmcoil Engine s or other such fatty artifact creature that's tough to deal with, especially on turn 3 (with the right draws). He can also discourage opponents from playing Day of Judgment , since you'll be up 2 creatures as soon as they Day.
I do like Swiftfoot, but consider cutting it to 2, because with 4, it's likely you'll be holding some as dead cards at some point since you'll be wanting to drop your aggro instead of your boots.
Also, metamorphing your Lord of the Unreal won't do much to protect them since they only give Illusions hexproof, not all blue creatures you control. They do however, work well with Grand Architect.
Bump your Phantasmal Dragon s up to 4, throw in some Wurmcoils and counterspells, and I think you'll have a solid deck going here.