Not actually horrible except that spell power is only good with mass spell casts or massive number of targets spell casts. So you either need a whole bunch of shots or something that shoots a whole bunch of targets at once. Makes me thnk of Flamestrike, Greater Arcane Missiles, Arcane Missiles, Razorpetal Volley, Defile, Consecration, things like that. I don't think it's that awful, but I don't usually use spell power minions.
This plus Defile? Why not just run 8 mana Twisting Nether in one card.
I guess it is usable for face burst. Fireball, Mind Blast, stuff like that. Or 2 Eviscerate. But a clunky 6 mana minion.. You can't expect that it sticks on the board. For OTK Kobold seems better since there are more combos.