By reasonably attainable, I think that means heroes that you are able to produce with your training camps. Dunno if they’re called “standard” heroes or “classic” or what.
And I’m actually going to download an app that’ll let me take video of my phone tomorrow, just to show you how it can be done. While I’m not concerned about whatever credibility you may think I do or do not have, in the least I feel bad that you’re so doubtful that you’re missing out on some strategies that really could help your game.
But no complaints that my Grimm has his talents up or anything like that, I’m not giving up a percentage of my emblems just to try to convince you that I was genuine trying to give you advice. But I will say that my leader encouraged me to practice stacking before the talents were even part of the game, and I had success.