This is just a list of cards I've seen discussed her and on Reddit that even a provision cost change won't fix. Feel free to add any that you think have been missed or aren't seeing a lot of play.
Waters of Brokilon - strong effect (summons 2 x 4 conditional self-boosting units) and replayable. Has probably seen the longest run as a staple card in T1 decks in the entire history of Gwent. Edit: As of update 5.2, WoB provision cost was raised by one. As we've seen in the past, tiny changes in provision cost aren't enough to put a card up for consideration of being removed from a deck if the card gives the deck a lot of power. If anything, Harmony players are more likely to drop Percival, since he's now vulnerable to removal for another turn due to decreased armor.
Yennefer's Invocation - effect too strong in many areas. Unanswerable, and too flexible in that it can provide removal and tutor synergy. Edit: as of update 5.2, YI lost the ability to remove an artifact from the board. However, whilst she is no longer as flexible, she still has a lot of flexibility for a removal card. I can't see any reason to cut this card over another unit removal card, such as Leo Bonhart, in order to run a card like Korathi Heatwave.
Damien la Tour - repeatable leader effects. The ability to replay a leader ability has often caused more problems in Gwent than solved any. Currently Damien can be cloned, allowing NG to repeat a leader ability twice in the one game.
Scenarios - in general need a rework. NG and NR scenario are some of the least popular matchups in the game. MO scenario might be better if its sequence were changed so the Barghest spawns last so as not to have two consume units and potentially not enough targets on the board at the same time. Also rules regarding a limit on the number of scenarios per deck should be formalised prior to adding any new ones. Given how strong they are, one per deck, regardless of name, would be the best rule.
Edit: per update 5.2, Caretaker no longer resurrects artifacts. While being a good start in this current meta, it is more a solution that sidesteps, rather than addressing and fixing, current and future probems that scenarios present. Additionally, NR's scenario may have been dialled back a little with Reinforced Trebuchet gaining a machine tag. CDPR seems to be of the opinion that the other change to the card, reversion to its earlier unispired ability, will somehow make the scenario easier to play around. It will be interesting to see if the loss of extra ping damage and less dwell time in setting up the Bombardment phase of the scenario will translate to a real reduction in tempo that scenario typically provides.
Bribery - This card seems to have a very high synergy with creating gold cards, usually the strongest one, from an opponent's deck. Though it can occassionally produce a weak bronze, its randomness really needs looking at as most of the time it seems to produce a card that is capable of swinging the game in the Bribery player's favor.
Edit: 25/02
Cards that might be problematic in future metas.
Sukrus - Currently not a big issue, since competitive SK doesn't seem to rely on defenders, and defenders by and large have fallen out of favour with the meta. I do recall when defenders were first introduced, that it was theorised that playing a defender to Surkus' left would effectively render the whole row immune, including its defender, At the moment, he effectively adds another turn in removing a protected piece, but should SK develop a deck that benefits from defender synergy. After further discussion, it seems Sukrus+Defender combo can be interupted. For most factions this is entirely accomplished with removal and having those cards to immediately answer it. NG has the option of using spies to seperate the two cards, so it may just be a case of expanding that tech to other factions, should a future meta evolve where this combo becomes a core component of SK decks.
Waters of Brokilon - strong effect (summons 2 x 4 conditional self-boosting units) and replayable. Has probably seen the longest run as a staple card in T1 decks in the entire history of Gwent. Edit: As of update 5.2, WoB provision cost was raised by one. As we've seen in the past, tiny changes in provision cost aren't enough to put a card up for consideration of being removed from a deck if the card gives the deck a lot of power. If anything, Harmony players are more likely to drop Percival, since he's now vulnerable to removal for another turn due to decreased armor.
Yennefer's Invocation - effect too strong in many areas. Unanswerable, and too flexible in that it can provide removal and tutor synergy. Edit: as of update 5.2, YI lost the ability to remove an artifact from the board. However, whilst she is no longer as flexible, she still has a lot of flexibility for a removal card. I can't see any reason to cut this card over another unit removal card, such as Leo Bonhart, in order to run a card like Korathi Heatwave.
Damien la Tour - repeatable leader effects. The ability to replay a leader ability has often caused more problems in Gwent than solved any. Currently Damien can be cloned, allowing NG to repeat a leader ability twice in the one game.
Scenarios - in general need a rework. NG and NR scenario are some of the least popular matchups in the game. MO scenario might be better if its sequence were changed so the Barghest spawns last so as not to have two consume units and potentially not enough targets on the board at the same time. Also rules regarding a limit on the number of scenarios per deck should be formalised prior to adding any new ones. Given how strong they are, one per deck, regardless of name, would be the best rule.
Edit: per update 5.2, Caretaker no longer resurrects artifacts. While being a good start in this current meta, it is more a solution that sidesteps, rather than addressing and fixing, current and future probems that scenarios present. Additionally, NR's scenario may have been dialled back a little with Reinforced Trebuchet gaining a machine tag. CDPR seems to be of the opinion that the other change to the card, reversion to its earlier unispired ability, will somehow make the scenario easier to play around. It will be interesting to see if the loss of extra ping damage and less dwell time in setting up the Bombardment phase of the scenario will translate to a real reduction in tempo that scenario typically provides.
Bribery - This card seems to have a very high synergy with creating gold cards, usually the strongest one, from an opponent's deck. Though it can occassionally produce a weak bronze, its randomness really needs looking at as most of the time it seems to produce a card that is capable of swinging the game in the Bribery player's favor.
Edit: 25/02
Cards that might be problematic in future metas.
Sukrus - Currently not a big issue, since competitive SK doesn't seem to rely on defenders, and defenders by and large have fallen out of favour with the meta. I do recall when defenders were first introduced, that it was theorised that playing a defender to Surkus' left would effectively render the whole row immune, including its defender, At the moment, he effectively adds another turn in removing a protected piece, but should SK develop a deck that benefits from defender synergy. After further discussion, it seems Sukrus+Defender combo can be interupted. For most factions this is entirely accomplished with removal and having those cards to immediately answer it. NG has the option of using spies to seperate the two cards, so it may just be a case of expanding that tech to other factions, should a future meta evolve where this combo becomes a core component of SK decks.
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