This made GaGaGa Cowboy a pretty neat XYZ Monster to bring out when you want to push for a game or get rid of a tough Monster on your opponents side of the field
The other two are level abilities, one activated ability to advance the Class to level 2 and another to advance the Class to level 3
Modern Horizons 2 is an absurd set that sort of broke Modern for a lot of people, but were talking about Commander here, so thats a problem for another time
Using the combined forces of "Dark Magician" and "Dark Magician Girl", (via "Ragnarok"), Yami Yugi destroyed "Ra" while Yami Marik was infused to it via its Point-to-Point Transfer effect
The product it was in, Champions Path, did not release with its own format, instead being added to other releases
For Airbenders, the Airbend Keyword action allows players to exile a card and then pay 2 colourless Mana to cast it rather than its regular cost