Lot of wise people here stated something so i have Trump my way into this duscussion too
There are 12+2 Mages. There were not fully probed and they will not be as they card and play options change with each new expansion. But not all mages are equal. Good player will beat a bad player with any kind of mage but Best player with Priest will have disadvantage against Best player with Druid. Thats a Fact, that can only a luck during dice rolling can change.
2- Abilities that work dependent of who the opponent is or what he does.
This is where you find abilities like Holy Avenger, Wounded Prey, Veterans. All abilities which require your opponent to somehow play into your abilities before you can use them. These are the abilities that are generally considered "weak".
- AGREED
I feel that Orc Warlord and Priest need a little help. Johktari need less help because one or two new spells could help her greatly.
I really think some mages could really use an ability card upgrade, but I don't think it's problematic at this moment. An ability card is still only a little piece of the mage. Things like school training, cardpool, mage specific cards make up for a bigger portion.
- AGREED
I arcanly wonder, how much possible is to find this Trio officialy Errated
There is an alternative explanation ...
I assume that for those abilities to be carefully *disabled* against some mages or creatures due to the balance reasons as you describe it would be way too much grandmasterish.
Blizzard and his products have balance issues (even the small ones counts... i am looking at you Genji from OverWatch!) , NASA isnt 100% mistake proof either, even if they should be and the examples could go one and one.
If i play as warlord with goblin swarm, i would really welcome to have those other Battle Orders from Dwarf with a better way to distribute Vet tokens. Thats probably my selfish reasons not a need of balance