Discussion of level 4 monsters.

I think that magical and black dragons are the coolest of all)). Magical dragons are cool because of their magic, and black dragons are just very strong))).

Black dragons are not just very strong :) They have 100% magic resistance, which is definitely a plus and sometimes the key to victory, although this can also be a disadvantage, because you can't cast protective or blessing spells on them, and you can't heal or regenerate them... oh well. But there must be some drawbacks ;) And also... they are not cheap, they require a lot of sulfur, and then it is difficult to buy them, and they are born rarely. But otherwise, they are just super units :) Much better than slow hydras :)
Magic dragons (by the way, specifically Magic dragons ;)) are also good, but... they have little HP, they are generally weak in melee combat, and they are useless against resistance. If you are playing against mages, then Phoenixes are better, they are strong and can fly, and they have fire protection, they attack 2-3 at a time (if they are in a group), and most importantly, they can be reborn, if, of course, their mana is not stolen :)
Recently, when playing as Nature, I prefer them, although it depends on the opponent, of course :)
Well, that's just my IMHO :)