Here are my picks for best cards in each color/category:
Blue: Psionic Blast , Teferi, Ancestral Vision .
Psionic Blast is just nuts in U, Teferi can wreck havoc to control decks and Ancestral Vision will see regular play due to being a very powerful card drawer in the format.

Update: Shadow IS the Bomb.
Based on early reports it looks like a good strategy during the Time Spiral pre-release is to go green and leverage the new found power of thallids. Yep Thats right, Green is again in with Red and Blue having trouble keeping up in the burn and counter department, respectively.

TIME SPIRAL CHECKLIST Complete. Check out the Time Spiral Spoiler List after the jump. Note that time shifted cards are considered legal in whatever block Time Spiral is legal in.

I got this over at the official Magic forums re the possibility of 2 rares (1 foil) in boosters starting with Time Spiral.
Read the post.

Finally, my very own account on MTGO. I used to play an account way back in 2002-2004 that was owned and setup by a friend but after a long hiatus, im back with my own account.
Time Spiral is set to be released on the 30th of December so i need to sharpen my skills [...]