Aang, at the Crossroads's delayed triggered ability won't cause it to transform back into Aang, at the Crossroads if it has already transformed into Aang, Destined Savior, perhaps because several creatures left the battlefield in one turn
There is a ton about how to navigate Arena, the events and formats that are specific to the client and I'm confident you'll like what you learn
Im going to quote Gavin Verhey from the article that I linked up above: Game Changers 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
Its especially powerful when you get rid of a basic or a land that ETB and does something and your opponent loses a tri-land or bounce land
Metal Company: Pokemon USA Item Type: Single Card Series: Sun & Moon Guardians Rising Brand: Pokemon Release Date: May 5, 2017 UPC: 643690368465 Stock #: 160055 Our Guarantees to You, Our Valued Customer
Unit Count: 1.0