>CU01, CU02
Withdraw seems like the kind of mechanic I'd have to play with it to get a feel for how interesting/fun it is. I'd cost common withdraw highly, anyway.
>CU03, CU04, CU05
At first it seemed to me that Abundance doesn't fit in blue, but blue does aspire to perfection and to achieve great things. Definitely seems like a black - maybe Sultai - mechanic overall.
>CU06, CU08
Both are excellent designs - I particularly like the way you explore the design space opened up by evergreen Scry and Prowess with Adherent. I doubt these would be printed at common under NWO, but one of the luxuries of a custom set is that you don't have to appeal to new players.
>CU07
This should probably target.
>CU09
Might be too good in Limited at common. I don't play a lot of draft, though, so take this with a pinch of salt.
>CU10
Could be more interesting/flavorful if it affected all creatures. Fine as is, though.
>CU11, CU05, CU13
Any reason these don't check for "a spell with converted mana cost 5 or greater"? Also, Scholarly Insight seems very strong when cost-reduced - make it 4UU, and cost [4] less instead? Makes it less swingy.
>CU12
Excellent realization of the flavor in mechanics.
>CU14
Augment is a promising mechanic, but this could be worded in a more simple manner - "whenever you cast a spell, you may pay 1U. If you do, tap target creature". Not identical, but very close. There's no real problem with the card - just something to consider. No need for excess complexity.
Overall, I'm impressed with the rigor you're showing in your design. Flavor seems to work well, too. Have you made any other sets?