Wicc
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Regarding version 1.3.7, that was my mistake; I didn't notice it... I've fixed it.
As for "it will get boring" – I don't think so. People have been playing with the same Castle in Favorites for years, and somehow it doesn't get tiresome.
To properly assess the balance of the Cove, you first need to master it, and the more games you play, the better. The finalists will likely play 7-9 games, which isn't too many.
Besides, nothing prevents players from mutually agreeing to play with other Castles.