Like most Pokmon cards, the value of Porygon-Z-GX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (SM Black Star Promos)
I do value the mana highly, and I have this above Arcane Denial, which I think is better than every other two-mana counterspell, two is just too much mana for a counterspell for most decks
Frequently Asked Questions What is the most valuable Japanese Pokemon card
Instant Standard Pioneer Alchemy Historic Timeless Competitive Brawl Historic Brawl Uncommon War of the Spark Constructed Standard Stats Limited War of the Spark Stats 56.1% 7.2% 56.4% 1,900
Credit: Wizards of the Coast Agrus Kos, Eternal Soldier FromTheShire: A super cool new Commander, Agrus does a similar thing to some other very fun Commanders we've gotten in the past, but resonating abilities across your whole team is something we haven't seen before
Pitching Avacyn, Angel of Hope or Reya Dawnbringer to draw two cards and ensure that they can be Late to Dinner feels awesome , and if you run enough colorless sources you can even jam in new Emrakul from MH3 to take advantage of that discard outlet you always have access to