Weird situation

So, I just played this week’s Tavern Brawl (Pick 2). I was a Warlock playing against a Warlock. We both were using Soulfire, but his cost 0 and mine cost 1.

Since it was a TB I dont really care, but I’m just curious why that might be?

Your opponent used a deck code that includes the Classic version of Soulfire. This was also possible last time this Brawl was offered, but Classic was an actual mode at the time

I doubt anyone will be banned over it but I would consider it a bug exploit