Suggestions.
*Undead Battery: Free metamagic by draining HDs from undead, so negative you can drain other negatives.
*Ritual of Dark Flame: Shoot a 20d6 negative energy ray by taking 2 wis damage.
*Energy Drain: DotF Armor enhancement, unarmed attacks and natural weapons bestow 1d4 negative levels.
*Grafted Tiny +1 Necromantic Starburst Ballista: Shoot 'fireballs' of 1d8 piecing damage that animates everything in the area.
*Ring of Greater Desecration: 24k and you are a walking Desecration effect, the one permanent shrine in the area is of course you.
*Sacred Exorcist 1 or Shroudcrown : Gives the Turn Undead Class Feature to permanently controlled undead via Rebuke/Command.
*Various Turn boosting equipment: To increase the effectiveness of your new Turn Undead ability.
*Mention of Heart of Water: Swift action FoM that lasts CL rounds by sacrificing a CL hour swim granting buff to skip Travel Domain.
*Mention of Cloak of Turn Resistance: +4 Turn Resistance for 11k, you might want it if undead.
*Mention of Sneak Attack: Enervation based attacks actually deal negative energy typed Sneak Attack damage (
source).
*Honorable mention of Touchstone(catalogues of enlightenment): Rebuke/Command Golems, like Flesh, Shadesteel or Grave Dirt for flavor.
Think that's all I got off the top of my head.
All that time spent on Feats, animate by doing this, Bind that, visit here, but no effort on items...
Also as written Arcane Spellsurge makes all standard spells swift, no pick and choose and I'm pretty Spellguard is a binary effect applied at casting, if not it costs to change type/subtype limits anyway making it far from feasible. Likewise I so no information of how you obtained it so I guess you're blowing a 9th level spell slot to Wish for it?