Help! I'm playing against human players with mages, and my hero is Orac, while theirs is Laslo.

So, firstly, if there's darkness, prioritize controlling the Knights and Berserkers. (The hero is an Oracle, so he casts spells frequently.) Of course, he can use Cleanse... (What magic does he have in his guild?) But it's not guaranteed that he has it. Definitely take Enchantment. But I would take Darkness and Chaos against this player, along with 2nd-tier Golems. Mark them and send them into the crowd, and then use area-of-effect spells. Describe your spells in more detail. Does he have Utopia, Mage Guilds, what's the map size, etc...? Block the Archers. Knights. Are there Archangels that can kill them...? Still, 3 archers. And some mini-artifacts...

Added 2 minutes ago
In short, the chances are good. Just write everything in more detail...

Added 6 minutes ago
Put mini-artifacts on the defense units (the "taburetkam"). They will finish the game well. If there were Armageddon, you would absorb it with the Golems (at the end) and then cast Armageddon. The Golems regenerate, and the "taburetkam" don't care, and the player's troops get blown away. That's how it works.