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The wild hunt should be their own faction. It’s nuts to me that they are considered part of the monster faction. The best argument is they are natives of the same world, but their is little to no evidence of the hunt using monsters to do their bidding.
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Again, Isbel of Hagge being Nilfgaard also makes no sense (especially since she is a kind of hippie, until she joins Meve against Nilfgaard and breaks that vow to attack them ... which is not exactly the same as standing on that side ...).
Factions basically find members for racial and national reasons, their intentions do not matter for that.
MO is basically everything that comes from another world, it does not matter if they would even hate each other.
I would argue that there are enough good witcher cards... the problem is there is only one bronze witcher unit, and he is not that good, so making a whole witcher deck is quite hard. But there arent supposed to be that many witchers walking around, they're a rare species, that's why it makes sense to have more named/gold witchers than some random bronze ones.
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The thing is though that the Viper school turns into hired assassins and a command of at the very least 4 Witchers do Emhyrs biding as assassins in the epiloge of The Witcher 1 and The Witcher 2.
That is reason enough to consider them a commando and since Gwent is less about size (putting SK, ST, NR etc equal), so that should be enough for a package.
Letho was changed to work with Serrit and Auckes, which is a good thing (although they would deserve a buff), it is hilarious that the Viper Witcher does not even make sense in the same deck due to his nonsensical mill ability, despite being one of the Assassins of Kings.
Furthermore given that even smaller groups can be packages/smaller archtypes it would make sense for Witchers to have a playable core.
Not everything in Gwent happens at the same time (quite the contrary in fact), so the attack of fanatics on Kaer Morhen is already a reason to consider them as a group (at the very least in one instance).
Furthermore one could also finally make the bomb keyword supported, there is no need to make a Witcher archtype about a lot of units (although there should be a couple of units).
Regarding the attack on Kaer Morhen (which is mentioned at the start of The Witcher 1 (from fanatics), as well as the attack of the Salamanda (including Savolla) and later the attack of the Wild Hunt) that fortress should also fullfill all the requirements to become a Scenario (given national reasons it would also make sense to make in a NR scenario).
That all being said, I feel that before long they should introduce an additional limitation that one can only have 1 (or maybe 2) Scenarios in one deck (as they already announced they will at some point add more).
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But there arent supposed to be that many witchers walking around, they're a rare species, that's why it makes sense to have more named/gold witchers than some random bronze ones.
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But there were, which by Gwent standards is enough to add them.
Furthermore all the still educated/young Witchers of the different schools for fit perfectly for bronze Witchers (e.g. murdered Wolf school members from the attack of random fanatics on Kaer Morhen).