Its a moment in time for the card game when it was still a startup trying to make its way in the world
One new Food in particular from Wilds of Eldraine is awesome for this, and Ill get into that shortly
The dark, moody aesthetic of the Team Rocket set suited Mewtwo perfectly, and the artwork captures the controlled, weaponized version of the character that the armor was designed to create
This is a great way of stunning your opponents plays, protecting Elektross, and having easy prey for your Elektross to score a few points in the process
Historic The next format that you can get into in Arena is Historic, which allows you to use all the sets on the client to make your deck
This list also includes my fastest random Shiny to date, being my Whirlipede at just 2 Friend Safari encounters, equal to about 16-32 encounters full odds