I didn't think about Inspiration... so it will work even if Zealots have Anti-Magic? In any case, if the enemy hero isn't prepared for this, they will move less often. You can take advantage of this by slowing down their creatures or speeding up your own, and everyone can work together to take down their armored units while everyone else watches. Or, you could take Summoning magic and constantly cast Phantoms on Knights or Archers.

Added 1 minute ago
We need to check about Anti-Magic. I don't remember if it can be cast on enemies.

That's right, Inspiration is a physical skill and is cast on top of Anti-Magic.
In any case, there are many tactics and heroes against Laslo, and there are many ways to win against him. I was just leading the discussion to the point that Laslo, as a Haven hero, may not be inferior to Axel and Miiv, who many consider to be the best Haven heroes in the late game. Even Dugald, with his archers and defensive play, can be a tough opponent and one of the best. I just noticed a trend on the forum that people consider heroes who specialize in a specific unit to be weaker than heroes who improve all troops.