Hmm...
Plus:
6/8, alot of hp and quite a lot of damage
card draw rivaling hourglass
bonus of precog
Neg:
Forced card draw
Costs a lot
Equal to hourglass if you have creatures that do the damage
It might be useful in a mono or maybe a duo deck, but rainbows aren't really interested in this (in my opinion) since:
1. the nymph isn't supposed to do the damage anyway
2. it has to be quinted which takes a quint away from an otyugh, fallen druid, firefly queen.
3.
:time vs
to draw a card (unless it costs
when upgraded
4. it costs a lot so it can't be popped early unless you have abundant time quantums... (not viable in a rainbow..hmm maybe if fully upgraded, but see 2.)
At least that's just my 2 cents, i just won one from the oracle and i think i'll take the 900 gold and upgrade something in my deck instead. It's a nice card, but it doesn't fit into my rainbow (i know it wasn't meant to anywho).
I would have thought a time nymph would be much weaker, in hp and attack, and cost less - so it would be easier to remove, but maybe the risk of a quint on it is too great...hmm still 4 extra aether quantums :S