My team was:
- Strange lvl 44/4R/5
- Star-lord lvl 44/4R/5
- Spider-man lvl 43/3R/5
- Captain America lvl 48/5R/5
- Teen Groot lvl 40/3R/5
I tried Heroic Map 5.15 with silver Teen Groot but I got wiped. Getting Teen Groot to Gold made a big big difference. Carol at 3 could likely make the same impact. And even though I have Steve at vibranium rarity, I use his 1st ultimate, the healing one, because that gets people to stick around longer.
The big thing is to 3-star the map because you’ll need to get 200 arc reactors and beating H 5.15 the first time will only get you to 110 reactors.
Hope that helps!
Captain Neverever 