Oh hi there :eek: ...speaking of 3 years ago.... it's been about that long since I last posted. Looks like you inadvertently necro'd a user along with the thread.
I still run
Pyrokinesis happily. A vast majority of the time, it at least meets one of the two min cases of (A) going even as a 2 for 2 or (B) being worth the tempo to 2 for 1 yourself. Anything more than the min cases is outstanding. It's useful in pretty much any deck (as long as opponent consistently has some small creatures) and has additional value in comboy/spellsmatter decks.
On the other hand I recently cut
Firestorm because it's more niche and less popular. It doesn't go in as many decks because it can be awkward to use (you really need multiple ways to mitigate the card disadvantage/be able get value off of it AND you need to draw them). Niche reactive cards are generally much less popular and drafted much less than niche proactive cards (
Birthing Pod, etc).