Perhaps you could try out 2 Merchant Scroll + another Chain/Rebuild in the Diabolic Edict and Skeletal Scrying slots so you will always find a way to kill Colossus. Merchant Scroll isn't always dead as it can always grab Recall or Force unlike Edict.
Is there any particular reason for not running Lotus Petal?
Why only 3 Confidant?
I think the deck looks cool with a good disruption package and lots of random brokeness.
Hmm, never thought about Merchant Scroll, my only worry about Scroll is the same thing I am thinking about Demonic Tutor, 2cc sorcery that isn't disruption or a threat, isn't great, but it is defiantly worth looking at.
There are two reasons for only 3 Confidants. The first is I only have 3, but getting the forth isn't a problem. When I was goldfishing, I just threw in a Scrying and found it to be really good, so I think I want to leave i in.
@goobafish: I don't think I want a ToA clogging up starting hands, although with all the life loss from Necro, Confidants and Scrying, maybe 1 Tendrils would be okay. I would defianatly give it a shot.