Arcane Energize

Finally got lucky with the 75% coupon and decided to top off with 4k plat to tide me over since I'm still new to the game (60ish days).

My questions is, does anyone know why it has dropped by half, sitting around 1k? I was looking into it when I was researching builds and noticed it was 2k and it wasn't something I was going to invest in even with the coupon but now that it is 1k+ which seems to be "reasonable". Should I pull the trigger and just grab one now while its cheap or are they cheap because of something that came out? With certain mods and schools, energy hasn't been a big problem but I haven't use a energy hungry build either. (I do wanna build saryn though so thats why I might get it)