The log is so close to being great but it's not quite there. Zap is part of the problem in that it's just straight up better, but I'm not sure how you address that without nerfing zap into the ground (e.g. making goblins unzappable) or making the log overpowered (which it almost certainly would be if it could target air). Maybe if you made it not do enough damage to kill minions, but then it couldn't kill princess, and that's one of the few things it has over zap right now. I guess I'm saying I'm glad I don't design games for a living.