Guidance of the Avatar is very useful, but I have to be the one to cast it. Thank you, though.
No, you don't. One of the best Spell Storing methods is a Glyph Seal. This item is in the MIC, on page 161. It is basically a Glyph of Warding that is reusable.
Spend 4k GP on a Greater Glyph Seal, and never look back. Why?
Unlike Glyph of Warding (GoW), it doesn't restrict you to storing only harmful spells. If fact, it explicitly states "any arcane or divine spell". But it triggers just like the spell glyph function of GoW. Which mean that, yes, you can put a personal spell into it, and it affects the person who triggers the 'trap'.
So he puts Surge of Fortune into it, then adheres the thing to a box or book or something, then you open it. You get the spell. At his CL.
Repeat for Divine Insight.
Repeat for Guidance of the Avatar.
Alliteratively, you can also use the other Spell Storing tricks out there.
Spell Storing property arrows to get 50 x 3rd level or lower spells put on you.
Debatedly, a Ring of Spell Storing might not need UMD to activate other classes spells.
Delicate Disk, is awesome.
One thing you'll notice here, though, is that nothing is free. The main reason I like Greater Glyph Seal is because it is cheap, and reusable. And trust me, once you start using that thing, you will find yourself using it a lot.