Then if you control exactly thirteen permanents, you may sacrifice this enchantment
its a list of 40 (currently, anyways) cards that dramatically warp Commander games, allowing players to run away with resources, shift games in ways that many players dislike, block people from play, efficiently search for their strongest cards, or have commanders that tend to take away from more casual games. Heres the list as shared in the announcement article: Itll definitely be interesting to see how the Game Changers list evolves over time
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By completely removing every players ability to produce mana outside of mana rocks, treasure etc
But, ultimately, fans wanting to collect every single card in both variants have a hunt ahead of them, but hopefully, this check list helps