Please don't say Crones are just equal to Letho, Serrit, and Auckes. Crones are more OP than any other cards that work together. The reason is obvious and no one talks about it. While every other work-together cards need their partner to be in hand or on board, Crones just want the other cards to have been played. This just means that, their value is carried over and gives incredible proactive play.
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Yes, they are carryover, however let us be serious here, the first should always be Brewess (outside of specific decks), given that a multi consume later can actually be game-losing, depending on the matchup and in that case Brewess is a Celaeno Harpy with 2 more povisions and no upsides.
In that case the other 2 Crones will be 1 and 3 above curve respectively, meaning you get 25/24 points/provisions and 1 consume.
I agree that the carryover is a strong aspect, however they need setup, playing the least useful first for a mediocre to no synergy Brewess, just to be able to play the others later, while Letho will be an immediate answer with up to 1 above curve AND a lock, while Serrit can be 1 above curve and be a no-setup answer to engines, while the last one (Auckes) can still be a 2/2 higher Alba Armored Cavalry.
In that case they are 24/24 with 2 locks, which is a higher impact and depending on the matchup Auckes can be a deadlier Gimpy, shutting down Water of Brokilon, Portal engines (in case of 2 copies of the same), Nekkers and actually useful engines one runs 2 copies of.
My point is that the Crones have far more consistency and allow more variation in how they get played, while Letho/Serrit/Auckes are higher impact and are by far the best cards in Nilfgaard, which is sadly a faction with an awful faction identity.
To be fair I would like Nilfgaard to have more of these hand packages, however Palmerin was a massive disappointment in the expansion, which could get changed later on (remember the journey of Letho, until he was finally good and adding a lot to Nilfgaard).
To be fair though, these packages are (apart from the concept of Bear Skellige and a few other themes) my favourite aspect of Homecoming and Letho/Serrit/Auckes and the Crones are adding a lot to their respective factions.
I only wish that Palmerin would actually make sense in Nilfgaard, thus be worth playing with Milton and the "indirect" self reveal for Nilfgaard would grow that way.