Is 13 gems too hard if you’re trying? No, and every color but brown has a targeted transform, along with plenty of other generators. Are the conditional effects on some other troops affected by the change powerful enough? No, but they’re already thinking about fixing that:
I don’t see the point of all the moaning. Constructive suggestions for how those troops could be brought up to par would be worthwhile. Complaining about known issues that they already plan to address accomplishes relatively little.