Even for energy mechs it pretty much is only possible with something like dual Valiant + Windforge/Faceshocker.
Just look the minion mechs’ and the boss’s energy cap and regen.
To be able to win this portal on insanity with just 1 repair kit (which is the average when I play this portal) I have to start the battles against the minion mechs at distance 5, then deploy my drone and in the second round use dual val to drain the mech empty.
Otherwise those minion mechs blast too many holes into my mech.
Even with this strategy I still receive around 1000 damage when I am lucky with RNG from the minion mech’s attacks.
On Insane Mode pretty much my damage taken in ideal battles where I receive really low damage amounts to:
vs. a tank: 500 damage
vs. minion mech: 1000 damage
vs. boss: 400 damage
That totals out to 3400 damage if everything works perfectly to my advantage.
But if I am just a little unlucky that easily increases by 100-150 damage per opponent.
=> 500 - 750 more damage in total.
So with 2656 HP as max (includes 20% from premium) that means I have to be quite “lucky” to get one run through successfully with that average drop of only 1 repair kit per run.
Btw. “lucky” means I keep reloading the website every time I take too much damage from one opponent or start at an unfavourable distance to the opponent.
So basically I need about 15 minutes - 30 minutes for one single run.
That isn’t “playing” anymore but more like self-torture since a game is supposed to be done for fun while trying to pass that portal is a kind of labor and no fun.
And best of all… I got only 1 of 3 times a box from the portal and at best some epics from those boxes while half the time only getting rares…