Life is the safe choice for us, it means that we can spam PD and not really care too much about consequence. You can happily throw 6 dice at the first spell of the phase (Throne of vines obviously), roll double sixes, no worries, now I can ignore on a 2+. Then proceed to buff some skinks to T6 or do something else equally amusing.
The Dwellers Below is an excellent spell when used against the likes of Elves which I expect people will see even more of these days. T3, 50/50 chance of killing them, a block of 50, good chance of 25 going under.
Light is nice if you want to make saurus even nastier, throw in a few Vets or OB's and some strategic casting and you could have a unit that marches 10 inches, has ASF and could have 15 attacks in the first rank alone (5 wide just R&F) or if you're me, 13 from the rank and file, 5 from a SV, 6 from an OB giving a neat 24 attacks at varying strength that have ASF, not to mention the 12 from the 2 ranks behind. Who doesn't want 36 attacks? (Which could also be hitting at WS10, with re-rolls...)
Pha's protection is also nice if you want to advance as a battle line with blocks of saurus flanking your Slann-TG unit.
Even with the slap in the face that is the LM FAQ that states that a slann cannot use the Transformation of Kadon spell I do feel that Beasts should not be underestimated. S5 T5 saurus cavalry is not to be laughed at, The Amber Spear is great for taking out beasties or even cannons. S6 against average T6 means wounding on 4's, typically 3 or 4 crew, you roll well enough you could topple a cannon outright. Let's not forget the things one could do with a S8, A8 OB. Give him the Gold Sigil sword and he'll have I10 aswell, wont go first against things with ASF but against everything else he will be. Depending on how you gear up your Slann this is a combo that could be seen in games of 2500.
Death spells are a bit lacking in range.
Heavens is ok but a bit dull considering how little it has changed.
Shadows is a bit meadiocre aswell if you ask me.
Metal sucks...
-Eagle