I use:
1. Doom
2. Bloodsong
3. Shadowsong
4. Pain
5. Union
6. Painful Bond
7. Boon of Creation
8. Ritual Lord (E)
With a ritualist wand
(20% recharge and 20% castingspeed for communing spells)
And a straw thingie
(20% recharge and +30 hp)
communing 13 (+2 rune)
channeling 7 (+1 rune)
spawning 15 (+3 rune)
(not sure if i got the numbers right)
This build does have 2 problems, spirits recharge so fast that Doom doesn't do much damage. (its too bad you can have only 1 of each spirit, otherwise you could spam em around the place

Most of the time spirits target different enemies so painful bond isn't as destructive as it can be.
If all spirits target the same foe his hp drops really fast.
(can you force spirits to atack 1 target?)
I havn't really experienced energy problems, just keep boon of ceation up all the time.
If you run low on energy cast pain, you'll end up with more energy then when you started casting.