Yes that's the build I'm running, or at least trying to run! :)
Upgrade your gloves so it has similar stats but with increased critical damage bonus %. Very important stat. You can get a cheap pair for easily 20-30ex
Chest:
Dual/Tri res and with spirit.
Boots:
30-35 MS %
Dual/Tri res depending on how much you need to max out your res.
Helm:
Same here about res.
+ to maxmimum energy shield
% increased energy shield
You can find budget chest, boots and helm for 30-40 ex with those stats easy. Might wanna go for 30% MS on the boots at least if you wanna reduce costs. 35% usually costs a lot more.
Most important is your spear. You want to use tangletounge. As high crit chance % as possible. The higher it gets the more expensive. You can get one with 18-19% for about 20ex. Make sure to socket the weapon with "Soul core of ticaba" for an extra +12 % crit damage bonus.
And yes, item rarity % on gear affects currency drop. But don't expect any miracles of loot dropping. This patch is crap loot wise, even after 0.2g. Even made Fubgun quit until further updates, that says a lot.
If you want to farm for currency look for 3 towers close to eachother. Max out by using tablet cursors that has % increased quantity of items dropped (max is 7% on each tablet) They get expensive though. And use waystones that primarly has high rarity % on them.
But again.. Don't expect miracles. I've farmed maps with 100% increased quantity and over 200% rarity and havent gotten a single div in 20 maps. Sometimes better luck and a few div drops. But you mainly make currency from collecting rares and hoping for good rolls and/or do some crafting.
lmk if you have any other questions