I was working on a deck like this before, and it worked quite well. You don't need that many nightmares.
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4t3 5rg 5rg 5rg 5rg 5rg 5rg 5rg 5rg 5rg 5rg 5rg 5rj 5rj 5rk 5rk 5rk 5rk 5ru 5ru 5ru 5ru 5ru 5ru 5t2 5up 5up 5v1 5v1 5v1 8pt
Yes, I run procrastinations, because they've saved my life before. I like win ratios, not grinding speed. If you don't want them, throw in precogs in place of them.
If you have an eternity, take out 2 RT and 1 dagger, throw in an eternity, a pillar and a precognition.
Main weakness is going to be lack of damage, draws and high CC.