Skills in the game

Finally, I heard something interesting because the article isn't about figuring out how many troops each player will have, but about their skills!
Castle versus Dungeon – an interesting example where, in one of my games against a strong opponent, the speed of harpies was greater than that of any of my units, and the opponent used a tactic of moving all units forward and then using speed on trolls, and that was it... You need to prepare for the final battle in advance, and therefore, if Valeska gets a tactic skill, I think it's worth taking, because with that skill, they wouldn't be able to reach the battlefield so quickly...
What other interesting examples could there be?