Would you build the previous version of Deathfire Grasp?

Its a bit hard to find details about this, but when I started playing in S2, DFG a) had a skull symbol and b) a different effect that * I believe* went like this:

Deals 25% (+ somewhere between 2-5% AP) of the target's maximum health as magic damage.

Essentially, instead of amplifying the rest of your kit, you gained a standalone tankbuster spell. I find this especially interesting because % HP damage for mages has been bound to burn damage aka Liandrys for such a long time.

The current DFG is obviously more iconic, but how would you rate this one?