Any list somewhere what spells this works on? Yes, spells, since it's fucking called CounterSpell now it's canon that everything is a spell.

I imagine it doesn't work on AoE shit, so Nigfernus' skills can't be reflected at all. Abrams either. Against Haze it's useless.

Is it only good against Lash and Wraith ults then? I don't fucking get this.