Its a good suite of abilities, and a very easy fit in basically any Green deck
[1] Bandai has created an official free tutorial app that teaches the basics of gameplay
While Ellivere is powerful and a perfect fit for this deck, you could interchange the face commander and alternate commander with ease, as Gylwain provides almost as much value as Ellivere
Holo Gyarados for example has 6 times more 1st Ed graded in total than in UED (115 to 18)
While the price tag associated with the Celebrations reprint (close to $6 right now on TCGplayer) isnt likely to make you rich anytime soon, if you do happen to have the original promo, that is worth a lot more
The Secret Alt Art of Gengar VMax for example is currently $730, which is over double the worth of the next Fusion Strike chase card down the line, Espeon VMAX Secret Alt Art, running at $329.58 right now