I was playing in a five-player star game with Brian David-Marshall, poker star David Williams, (future) CAG member Adam Styborski, and artist Eric Klug
Because that would be crazy powerful, we added an ability where you had to pay life to untap things, which also plays into the "impotence" part of the name
You can call it canon at any time because thats what the multiverse implies, but at the same time those promotional cards were just card styles and not actual standalone cards like the Street Fighter or Walking Dead Secret Lairs
If Deadpool took the Textbox of Alexios, even though Deadpool's name would not change, it would gain all of the abilities that affect Alexios
The sky is the limit with Xenagos, The Reveler, and the amount of all-around value that comes from the card makes it easily the best Gruul planeswalker out there.