Returning player. Two templar questions.

What is the cheapest build to start maps? What is the best build to help others farm?

I'd try cold spell crit totems build (safe, heaps of damage)
creeping frost bossing / mapping, freezing pulse leveling, played one 3.19 to mid 80s

https://www.youtube.com/watch?v=oXdvE8tox5c

https://docs.google.com/spreadsheets/d/1v72AZgtvuffNMKaE44MsyL7lvQ_L3GoaJqiNSWk_2LY/edit#gid=0