What kind of magic do you like?

The druid will summon mantises on his first turn, and the mage will hypnotize them)) and that's it)) you can create illusions, and just cast blindness on the druid... this is if both heroes are without an army)) but with an army, both are strong))

Let's say the druid summons a mantis on his first turn. The second turn, there's an 80% chance the mantis will move. And here are two scenarios: first, if the mantis reaches the mage, it's over. The mage won't be able to do anything because the mantis's attack and subsequent "Confusion" (I just don't remember the correct name) won't give the mage much freedom. Let him cast hypnosis. And the turn goes back to the druid. And now the druid can calmly cast anti-magic on the mantis, and the effects of hypnosis will fade. And now no magic will stop the mantis. The second scenario is the same as the first, when it's the druid's turn again. And now the mage's magic is powerless against anti-magic. The only hope is the mage's combat skills and the amount of mana the druid has. Even if the mage, ignoring the mantis, starts casting ice arrows at the druid, nothing prevents the druid from casting anti-magic on himself. Then let the mage go again, and he won't be able to do anything to the druid or the mantis. Then, when the number of mantises is enough to kill the mage, the druid can simply cast "Swarm of Bees" on the mage, and he will just skip his turn and only attack in return after the mantis attacks.

Added after 16 minutes
So that you don't think the druid is stronger than the mage, here's a battle scenario where the mage wins. So, the druid summons mantises. The mantis moves. It heads directly to the mage. Hitting the mage, it "stuns" him with its claws, but that's not important. The mage's turn. The stunning of the mantis doesn't prevent him from casting hypnosis on the mantis itself, as well as on the druid (provided the druid doesn't have magic resistance, or the mage has artifacts that ignore the enemy hero's resistance). Cast hypnosis on the druid. The druid's turn. Now summon a magic dragon, and the dragon will be under the same color flag as the mage. The wizard goes. Cast confusion on the mantis, and that's it. The enemy is under control. The mage's turn. Create a phantom of the mantis and attack the original mantis with an illusion. The druid's turn. For variety, summon a phoenix and start attacking the druid. Well, it's clear from here: the wizard holds the mantis. The mage creates illusions or a phantom. And if necessary, casts hypnosis on the druid again. While the druid is alive, summon phoenixes and use them to attack the druid. After the druid dies, they all attack the mantis as much as they can, and the magic dragon still holds the mantis, and here is the mage's victory.