Also I'd run Photons over Sparks because of Bone Wall, which is a big card against you. Luckily Plague is a bad card, so few people run it although you may see it sometimes in Bronze. Still, most times you won't. While Sparks can be used for a finishing move, it's very rare as you almost always only have one left over for that purpose. Once they're upgraded, Ball Lightnings are formidable, but Damselflies remain superior or even Gemfinders for a bit of HP.
Additionally, Photons do more damage over time as AI doesn't tend to spend CC on them. If it does, it's no disaster since they're not really gaining value.