=Lizard=
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it turns out to be just a half-measure.
Moreover, it's worse than simply banning top-tier heroes. Because even if you start with identical heroes, if one gets a hero like Gosha/Luna/Jeremy/etc. in the tavern, and the other doesn't, then it's obviously unfair.
Therefore, if you're going to duplicate heroes, you should duplicate all of them and mirror the tavern.
That's true. Even a hero like Alamar, for obvious reasons, severely unbalances the mirror match.