Magyars vs Koreans

I played a 3v3 arena game and got Magyars on the flank and was up against Koreans. What the heck do you do with that? Magyars would need bombard cannons or something to compete. He got a castle up before me but I fast IMP'd and trebbed it down. He built a second and I trebbed it down, too, using skirms pikes and UU as defense for my trebs. But he successfully ran both times with his wagons and siege so by the time he got a 3rd castle up, he had the korean deathball with halbs in front.

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The only play I could think was to go late game and try to beat him with trash to drain his gold? It didn't go late game because my two teams lost their 2v2 battle and it was over. but still, i had no answer for wagons/onager/halbs. I give him credit, he had a massive amount of halbs protecting