I liked going for an all out AoE hybrid(focusing on ring of fire, ice storm, freeze, and that explode thingy).  You get a lot of damage off and level very quickly.  Trouble is you're more anti creep than anti DG when you do that and very very frail.  I never have any luck with the anti DG type spells for some reason.

I'm working on a Hybrid TB build myself. I tend to go with Fireball, Rain of Ice, Deep Freeze (mostly for the lvl 15 synergy skill) Fire Aura, and then either Frost or Fire nova, depending on the match type and who I'm facing. Frost Nova is great for Tower Rooks.

The trick is to switch often enough that you keep both of the switch buffs active for the majority of the time, and get LOTS of mana gear. With enough mana, you can pump out your spells almost nonstop, which equals a heck of a lot of damage.

Come to think of it, in that case Frost Aura would be better for this build than fire aura, due to mana regen.

this is a utility build that i came up with, havent tried it as of yet:

1 fireball/circle of fire

2 deep freeze (i only see this useful for its interrupt so only 1 point)

3 fireball/circle of fire

4 fireball/circle of fire

5 frost nova

6  fire nova

7 fireball/circle of fire

8 rain of ice

9 rain of ice

10 frost nova

11 fire nova

12 fire ball/circle of fire

13 rain of ice

14 enhanced attributes

15 frost nova

16 biting chill

17 fire nova

18 enhanced attributes

19 enhanced attributes

20 enhanced attributes

the idea with this build imo is that you want to stay in fire mode while pushing lanes, but when ganking/team fights you want to be in frost mode for stuns and slows.stats could be changed to perma frost or fire aura depending on the way you want to play him.

also to be really honest i dont find the fire and ice ability that useful

Fire Nova is amazing vs creeps.  The whole thing where it makes them fly into the air means the ones that don't get killed outright will die because they went flying.

I have a hybrid TB guide up now, using mostly frost with Fireball and Fire Nova for additional damage. Check it out.

http://forums.demigodthegame.com/351255

And before you hate on this build, try it - I have found much success with it.

Eh, I find hybrids to be among the most effective TBs. Problem is that the form dancing can be kinda tricky and most people don't play to the hybrid strengths. A straight up Ice + Fireball build is murder, but I've seen more evenly split Fire/Ice builds be really effective.

And Circle of Fire is far from useless. For some reason, people have it in their heads that they should use it offensively, like "Hey there Unclean Beast, I'm gonna run up to you and make a fire circle... oh, I'm dead." Use it like a shield.

I pick up circle of fire on maps that aren't open. Cataract is a good example where circle of fire is good. Think of it as mines on Reg and the top end of the spell is 1500dmg which is the same as spit. Lay it down toss a fireball then switch to rain of ice and you have have a nice chunk of damage and it's all aoe except for fireball.

Ok I'll set the record straight here on Circle of Fire. It's really good for use with blade of the serpent for mana regen ( only if you put no more than 2 points in it as it kills enemies too fast. You want it to tick as much as possible before the mobs die). Also, it can be justified if you are fighting against melee DGs as when they run up to you to hit you they'll have to sit in the fire and the more points you put into it the more damage it will do ( and it adds up big time ).

The only thing is, to use it effectively you'll have to stack a lot of armor and hp so you can sit there and slug it out with the other DG like oak or erebus. Its worthless against a mine Regulus as he'll just snipe you. Against other ranged ice/fire ( only fireball) build is superior as it slows their attack speed ( and regulus relies heavily on his stupid auto attack from out of range for most of his damage).

Hope that helps.