Its close to 200k gems to completely max heroes, i dont know how much money that is though.
Th:10 ign: Aeneas lvl:183 clan: house of ares
Gold grab: 1.4bil lavas done! HH: 8.2m!
highest trophies: 4024 (barching)
Highest trophies: 4353 (gowipe)
highest trophies at th9: 3282(barching)
3 of them would do the job and it's not that mutch for me and you don't need to spend gem I easily got a lot of dark ELIXER in a week or a week and half to get that mutch but it's not that hard