So knowing this about the first two Pokemon in this line and looking at this specific Porygon-Z, the main reason you would want to use this card in a deck is for its Digital Reboot move, the reason you would want to use this move so often is to be able to reuse an Ability from let's say a Stage 2 Pokemon every single turn, like Aggron from Dragons Exalted (if you're playing in the expanded format) where you can use its Toppling Wind Ability to discard the top 3 cards of your opponent's deck every single turn and hopefully be able to win the game that way
Top 10 Black Bolt & White Flare Cards and Their Market Prices Share The wait is over
it could be Lingering Souls, Obzedat, Tragic Slip, whatever
Every Halo smuggler walks a razors edge between untold riches and sudden disaster
Ursula Sea Witch Queen steals the show If there was any question as to howe powerful the new Sea Witch Queen is from Ursulas Return, that question should be put to rest
The only downside is that this doesnt really enable any of blues archetypes, but it looks like a solid playable regardless