I'd only consider it in decks that can get around waiting like Cascade decks (Yidris, Maelstrom Wielder)
You now have everything you need to get in the game: the right bot software, a proper proxy setup, anti-detection strategies that actually hold up, and a scaling framework that grows with your ambition
First, Mew ex is a Basic Pokemon like the other two
Though this heavily serves red aggro looting decks, it also works well with black discard decks like Hashaton
In that case, you can easily get cards in the Lost Zone with Comfey [Lost Origin] and Colresss Experiment [Lost Origin], Lost Vacuum [Crown Zenith] a Forest Seal Stone [Silver Tempest] in play, accelerate Energy with Mirage Gate [Lost Origin], and attack with Radiant Greninja [Astral Radiance]