I think we can assume the game is over, so I would honestly be concerned if I see a Mega Zygarde being played against me
I do feel though they may be viable Standard and Extended options, but because of the extraordinary power-level of Extended right now, I think that perhaps there will be too many unfavorable match-ups, especially the modified Elfball, numerous artifact combo decks, and maybe Zoo, but if the deck can be modified to a state where it is a tenable Extended option, that's terrific in my opinion
Wishful thinking aside, Balance can swing the game around in your favorite in a lot of situations
I classify it as a very causal Bracket 1-2 deck, though the presence of Crop Rotation unfortunately means its technically Bracket 3 (why is Crop Rotation a Game Changer again?)
INGENIOUS INFILTRATOR Ninja decks are, by their nature, a feast-or-famine affair
Japan's Mega Brave and Mega Symphonia - Best Chase Cards These cards are commanding such strong values because they combine competitive play power, iconic Pokmon status, and premium rarity tiers like Special Art Rare and Mega Ultra Rare