It probably shows 'get more' as you need at least 5 heroes from the same class in order to merge destroying 4 and making 1 stronger.

I'll be grinding my way up to at least some max-level heroes / pets even if it takes me a year of daily 5-minute logins, It is a real challenge to get them so they should be quite valuable if the games catches on while there also is a rental system in place. I'm still learning a lot myself and will make another post with some good tips & tricks somewhere in the coming weeks. Next up is opening the next level of the @upvoteshares program which is well overdue as I have been postponing it with of Euro 2020 taking up a lot of time.