for minion builds Oak/erebus's seem to be the most effective. Sedna's is just laughable and Queens I have limited experience playing against good ones and overall I was not terribly impressed.
Pure Minion/Support Sedna /is/ viable. Don't get Yetis.
Favor: Ring of Divine Might
1. SAVE
2. Healing Wind I + Morale I
3. SAVE
4. Morale II
5. Healing Wind II + Magnificient Presence
6. Morale III
7. Heal I
8. Morale IV
9. SAVE
10. Morale V + Mag Presence II
11 - 13. Inner Grace I - III
14. Silence I
15. Silence II
16 - 19. Heal II - IV
20. Pounce I
Items:
Gunners + Gloves of Brutality + Minos
Boots of Speed + Unbreakables
etc etc other minion itmes
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I've run this several times and it's pretty effective. Not the best Sedna build out there, but it does do its job. RoDM helps her creeps and max morale demolishers do a lot of damage. Also, unlike a lot of other minion builds, your demigod is actually useful in a fight by standing back just in Healing Wind II range and covering them with MP. Then healing them as much as you can (375 mana is dirt cheap).
Your weaknesses are if you lose your monks and your demolishers you're pretty much dead in the water until you can res them. You also have no escape mechanism (unlike a Spirit Oak with Shield III or a minion Erebus with one level in Bite + Batswarm) so you can't play this against an Erebus. Or a TB/Occulus 'cause of their anti-minion. Oak will just surge your minions away, and against UB other builds are better. And it's not enough to really deal with a Rook by yourself
And queen will melt your creeps away...
j/k
It's an alright build and I've had some fun with it. It's awesome with an Assassin Oak/Fire TB combination because Fire Aura'd + Surged minions are vicious.