Every distinct wording since 2010, newest first.
September 1, 2023 · Wilds of Eldraine
If a card has any alternative characteristics, such as those of adventurer cards (see rule 715, “Adventurer Cards”), those characteristics are included when determining the card’s color identity.
November 20, 2020 · Commander Legends
If an ability refers to the colors or number of colors in a commander’s color identity, that quality is undefined if that player doesn’t have a commander. That part of the ability won’t do anything. Costs that refer to that quality are unpayable.