With phys explodey, this build is a beast when it comes to mapping. It's incredibly fun to play, super fast, and scales well with currency too.
POB: https://pastebin.com/zxQyiZ99
https://pobb.in/6iet6qEDxnfG
*forgot to show in the vid, but the pob has budget tree, gear set, and gems
EXPLODEY VID: https://youtu.be/iUtsjZjlzps
HOW TO MAKE THE SWORD
There might be a better way, but this is the pretty deterministic method I chose.
get a level 80+ shaper thrusting sword, and spam Woe essences, which guarantees spell damage, until you get either phys added as fire or cold, or both if you're really lucky, and an open suffix.
if you have an open prefix too, good. otherwise, you're gonna want to craft cannot roll caster mods and try to annul the dead prefix. once you have an open prefix and suffix, craft cannot roll attack mods, and slam an exalt. you have a decent chance of getting phys as extra.
ele pen is not bad, and you can keep it.
If you get +1 socketed gems, or don't want to settle for pen, you can try to annul it off like in the previous steps, and try to slam again.
If you annul the good mod you'll have to start over.
once you have your prefixes, just craft prefixes can't be changed and veiled chaos until you get something you're happy with.
for you budget bois, a cheaper method i think is to just fossil spam for the phys added as ele rolls, and then just craft spell damage after. check craft of exile for whatever's the most cost effective at the time.
TIMESTAMPS
0:00 intro
1:07 mapping
2:12 shield crush
3:07 gearing / alternatives
8:12 budget
8:55 leveling