Solar Eclipse Balance

Is Solar Eclipse Balanced? I ask because okay it seems like you pay 2 mana to “do nothing” unless you cast another spell, right? But that other spell can be 6 cost, 7 cost, or whatever. In which case it has effectively become a 2x pre-nerf Innervate (solar eclipse + 6 cost spell = 8 mana for 12 cost worth of spell = 2x pre-nerf Innervate = 4 mana bonus). But then I look at the actual Innervate card, and it is post-nerf innervate giving a measly 1 mana. Of course this gets exacerbated if you use more than a 6 cost mana spell, this is just like baseline trying to figure out how Balanced Solar Eclipse actually is. So now that we know Solar Eclipse is at minimum 2x pre-nerf Innervate, is it Balanced? And…how come Innervate is still nerfed, then?