Video about it https://youtu.be/oQVvZKjj7gg
The Midas trick:
Mostly used for fast progression when you start using the portal. Recommended portal level is 1500 below your highest reached level, levels 434 (plus 21 from pocket teleportation device ) lets you end up directly before level 456 where special loot drops start, (true for each 1k levels) so make use of this looting knowledge!
1 Uncheck the auto-progression in the map
2 Go back to a level where you can kill the enemies (hit the down arrow to cycle down through the mines in the map)
3 Hit a few enemies until you can hire Midas - Check auto-progression box again to go automaticaly back to your max portal level on next kill
5 Use his skill (hit a few times with it, optionally hire the clicker hero (your own) to do the first clicking skill for you)
Result: Hire your top guy!
Note: You might need a few gold artifact levels for this to work.
Open map
Uncheck auto progression box and go down to easy to hit levels by scrolling or clicking small down red arrow
Hire Midas
Open skill menu after you hired midas
To get enough money to hire your main hero, use the midas skill
Some artifacts benefit the skill and gold income, try working on them if the midas trick doesn't work good enough for your portal level yet