[3.8] GC mines, a lot of deeeeps

Any shaped rare with this three mods:
Socketed Gems are Supported by Level # Trap And Mine Damage
Socketed Gems are Supported by Level # Hypothermia
Socketed Spells have +2%\3% to Critical Strike Chance
Do not buy helm with 1% crit chance

Make sure that you have free Prefix for crafted +1 to aoe gems.

Pseudo 7-l for juicy damage. 3% crit will guarantee 100% crit chance even againts shaper\elder.
At least 1 white socket for future if you want to change gems.

As for me - before this helm im just running with tabula

Eternity shroud. Dont know if I really have to explain this, a lot of additional chaos(our main damage in endgame!) with full chaos penetration. No reason in +gem corruption or links - main link in pseudo-helm
Necessarily 5% gain roll.

You can use any chest of your choice before ES, for me it was tabula.

Rapier! Wait what?
In fact, wand with Phys->Lightning gain and Elemental->Chaos gain will be a bit better(~2.5% per each) than rapier. Soooo why not wands then? Well, main reason is - rapier is much cheaper at start of the league. Like 2-3 times cheaper and easier to find than wand with 40% implicit.
As extra - we have a bit(70%+) of additional %increased fire damage.
And as extra-extra(just my opinion): its easier to get %increased elemental than additional %critmulti

About crafted mods:
{Increased spell with additional gain}, nothing to compare to.
{crit multi}, but surely it will be better to have t1\t2 critmulti
{increased critical strike chance for spells}:
With 3% helm in endgame, with %inc-crit-chance on rings and amulet - sure, you can remove this mod, but... ugh, what you can change it for? Mine throwing speed is only good option, so I do not reccomend to change anything in this setup. But if you get elemental penetration - replace this mod.

Short conclusion: Its yours choice what to prefer, but main thing that required is 2 t1 "gain"s.

I prefer amulet with strength implicit. Any rare with 2 t1 physcal->elemental "gain"s.
Not "Non-chaos to elemental". Sure you can pick it up if it much cheaper, but this mod does lesser dmg that any of phys->elemental.

Mine throwing speed is priority(after "gain"s)

Good additional mods is %critmulti, life.
Other mods of your choice, it can be %inc-crit-chance, speed, or resistances.

Any rare shaped rings. I prefer Opal.
Assassin's Mark Curse on one of the rings.
Other mods of your choice(%critmulti, life, resistances, %increased damage(all damage -> spell -> global phys -> cold -> fire))

Any rare shaped belt. You can choose between global phys, strength or +life

Any rare shaped gloves, Fingerless Silk Gloves or evasion-based is priority.

Any rare shaped boots, Two-Toned Boots or evasion-based is priority.