How to deal with the drill mech?

[N3MES1S]

I remember long time ago i tried it with mage and was impossible for me, 2 days after that i tried with a warrior and the driller was TOOO easy (killed him with no losses..) so im wondering if the game lacks of equilibrium playing with a mage (yea u need to have at max. all spells, but i dont see that fair enough). I killed the drill with paladins, royal griffins and horsemen with no losses lol. But that troll strategy seems to be funny.