Every co-op LCG handles errata and card changes differently.
In The Lord of the Rings LCG, cards are only officially nerfed/errataed. Although players are encouraged to play how they wish, FFG’s changes are accounted for in reprints and are considered the official, final word.
In Arkham LCG, cards are altered through a “taboo list.” In short, this periodically updated FAQ allows for the designers to bring down the power level of cards that dominate the meta to encourage deckbuilding variety. Some cards are “mutated” (changed, usually nerfed) and some are restricted (forbidden) entirely from play. Again, this list is entirely optional: as a co-op LCG game, a lot of people don’t care about power levels and wish to play the way they want.
Marvel Champions LCG doesn’t have a solution yet. The designers may never alter any power levels of cards, as errata thus far have merely served as clarifications. To expedite the process and provide players with an optional way to play while we wait for more content; a small group of community members have gotten together to provide their own list.
These alterations have been playtested, and again; these changes are not official.
Mutated (suggestions from Astrodar)
Cards from this list have additional or altered text, as described below
- Ironheart (B ally):* Add “Play only if your identity has the CHAMPION trait.”
- Maria Hill (L ally):* Add “Max once per phase.”
- Spider-Man: Miles (B ally):* Add “Play only if your identity has the CHAMPION trait.”
- Dive Bomb (A event):* Remove (attack)
- Regroup (L support):* Change cost to 1 per player.
Forbidden
Cards from this list cannot be used when playing with taboo
- The Power in All of Us
- Go for Champions
- Make the Call
Hall of Heroes 