Miner
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I didn't attack dragons and djinns because they were psychologically off-putting. :) I decided to send three Barbarians to each Castle using teleporters. I gave all the artifacts to the one who was heading towards the Sorceress Castle, as he would encounter more battles along the way. At the crossroads, I distributed the troops evenly. One hero from the Knight Castle still managed to escape to the swamp, so I had to intercept him with my fourth hero. In general, all four teleporters were used. :) The following fact made the walkthrough easier: some enemy heroes with troops of the first and second levels rushed towards the dragons and, naturally, perished. They probably wanted to repeat Nzol's feat. :D