Adding [evil] descriptor?

[Dazed&Confused]

I wanna get spell focus (evil), so, any easy ways of adding the [evil] descriptor to my spells? I know there is the Corrupt Spell metamagic, but if I'd add only 1 point to the CD using two talents I'd rather just get heighten spell. There is also Diabolist, from BoVD, and Tainted Scholar, from Heroes of Horror, but the first one only gives it for 1-3 spells/day and I hate tainted spellcasting. I also thought of Arcane Thesis or Metamagic School Focus, but damn, so many talents for so few spells wouldn't be worth it.

So, any other ways besides those?

[deuxhero]

For the same effect SF:[ice] and some +0 Metamagic from Frostburn works FYI.