Im re-reading all the spell lores and evaluating how good they are, and reading metal again 3 times, i realise it's pretty good, not as great against some armies, but still great, so thank you nova.
In shadows, there is 1 spell i do not like: Crown of Taidron. It hits all units, even yours

, but steed of shadows is awesome.
In beast, most work well, but crow's feast is basically a weak fiery blast, etc., but is still ok.
In heavens, I don't like Second sign of Amul, It only gives you D3 Rerolls, but, I guess, that COULD in reality save a character, but you don't really know when that'll happen. OOOOOOOOHHH.... Re-rolling stegadon impact hits

...... No more beef about second sign.
Also, comet of Casandora can be deadly. I rolled bad, and it went of on turn 4, and i got a 4 so it went 16" and killed most of BOTH our armies, LOL

. The other 2 times in the game i used it though, it blew up like 2", so it did nothing.
Light works great against both demons and undead(Surprise, surprise

), and can heal your units. Not really any bad stuff there.
Life is ok, especially for wood elves, kill them in their own terrain, as well as heal ALL wounds on 7+
Death is good as well, destroying LD, causing fear, stealing life

, as well as having magic missiles.
And last(not first) Fire

. NOT my fav, even though powerful. Has nothing subtle, nothing that bolsters your troop, moves you, gains life, etc.
So, that's my overview. I don't really have favs, cuz some work better different times, in different situations.
Also, never give your slann heavens, you already have cheap level 1,2, or effectively level 3(EoTGs+ Plaque of tepok + lvl 2 upgrade) heavens casters.
PS: EoTGs+ Plaque+ 5+Ward = Armor save2+/Ward save5+ Lvl 3 wizard w/ giant triceratops w/ big magic lazer

YAY!!!