I was thinking of these two older troops that didn’t scale well at all for me:
Currently, Dark Master deals only 9 damage, regardless of his Magic. Making that actually kill an opponent is very hard, and just for 2 Attack for everyone? Even if you consider that it summons a Thrall, that doesn’t justify the high cost of 13 mana.
I’d recommend that you make his spell damage scale with Magic. Maybe [Magic], or [Magic/2 + X], I don’t know. But 9 damage is unlikely to kill anyone, even on Normal Explore. Or maybe keep the 9 damage, but always raise everyone’s attack by 1 when you cast the spell, even if you don’t kill anyone?
Ok, I get it, his main use is, well, summoning. But his healing is very weak, while the spell also costs 13 mana, which is very high for what it does. Ok, you get to summon a Ghoul, but I still don’t think it’s worth it.
I’m going to compare him to Naga Queen (which is UR, and Summoner’s Rare – I’m aware of that), whose spell costs 12 mana. She heals everyone for [Magic], and her magic caps at 4, but the kingdom bonuses makes her scale really well later in the game. Not to mention she also converts gems, which is a lot more useful than getting a Ghoul.
I know you can’t set Summoner’s magic to cap at 4 because of the summoning aspect of his spell, but maybe you could make him heal all allies [Magic/3] life? This way, a fully leveled (to 16, not ascended) Summoner would heal the same 4 Life, but he could also scale better for later in the game, when people have magic bonuses from kingdoms/statues/sentinels.
Maybe there are more troops like this, but those 2 caught my attention.
Thanks for reading.