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Can you help me explain on how this spell works with Spell Strike and maybe in concert with Spell Combat?

1) Can it be used with Spell Strike?
2) Can it be used in concert with Spell Combat?

I'm very torn for what to choose for one of the most important levels for the Magus, the campaign is loaded with spellcasters and we are about to face a lot them and specially a powerful Wizard King (maybe adapted/created epic level, yes our DM is very sadistic).

So I want to really really get the best out of my buck and I was thinging to get some stuff for my 15th I get a Magus Arcana and a Level Feat considering this is my final level, I dont know what to choose, here are some interesting options I'm considering:

1st Option
Magus Arcana = Spell Blending Enervation + Boneshatter/Calcific Touch
Spell Perfection = Enervation (for qualifying feats I have Piercing, Quickened, Persistant and Intensified)

2nd Option
Magus Arcana = Reflection
Spell Perfection = Dragons Breath (Quickened, Persistant, Intensififed or Piercing)

IMO 1st Option seems very interesting. And also I dont know what other spell to Spell Blend Enervation seems a perfect choice, other than that I dont know what other 4th level Spell is the right choice. So I need input please HELP!