I like the theme of it. If your Tavern is in ruins well it won’t be in your tavern anymore. Gaining a ruins is a bit thematic at least, but I agree it would be better to make it zero gaining. If there were other looters in the game your home brew might end up stuck on your tavern mat before game ends especially if cultist was in the game. And with it at zero gaining it might be interesting if peddler was in the supply too. Maybe...