Blue crystal

What if you deploy the entire army for a battle? Wouldn't that be an option?
The aerial unit has high initiative but the lowest attack/defense stats. A staff would definitely be helpful, or a mass slow effect. In the new version, the multiplier for the army size has been significantly reduced for the Guardians (from 2 to 1.3 when fighting a full army, and from 1.3 to 0.9 when fighting a partial army).
The random bonus for the army is only given once at the beginning of the game. Increasing stats definitely works.

I tried fighting with full armies, but I came to the conclusion that it's better to play according to the rules. For example, with a melee hero, even without a full army, I had 99 Lava Golems, 500+ Stone Golems, 250 Unicorns, 150 Rakshasas, 240 Mounted Archers, and my own 80 Rakshasas and 300 Golems; it would be unlikely to defeat an army twice the size of mine, because I could only win by setting up walls and killing stationary dragons over many turns. With a ranged hero, it doesn't matter who you deploy, they are weak. Against a flying unit, a hero with high intelligence manages to attack when only a few units remain from the army. I haven't looked at the mage yet. If it were possible to change the builds/mini-builds for a specific enemy, but even this option is not available.