They are pretty solid cards. All will be very playable in limited, maybe some in constructed depending on how the format goes.
Blue and red seem the best so far.
Blue can dig 5 cards deep! And is a 2 mana instant speed
PreordainRed has unconditional damage, which is always good. But the scry is probably strongest in red, where you can help yourself draw more gas when you are empty handed in the mid game.
White is nice because it is 2 bodies at instant speed. I think it would be bad without the life gain though, and 3 mana makes it a little worse than the others
Black is neat. Getting to choose your creature and at only 1 mana at instant speed makes this a really good version of
Disentomb. This is usually a sorcery speed effect, or conditional on the creature you can get.
I
wonder what Green will be? Probably 3 mana
Rampant Growth or 2 mana
Giant Growth again. But 2 mana
Giant Growth + scry utility seems okay.