If youre chasing your own GO cards, you can find listings and recent auction results on Rare Candy
3 [DF-03]is designed around the Op-Op Fruit, which is sure to captivate all One Piece fans
Breaking down pull rates for Obsidian Flame packs puts you at around a 1 in 15 chance of your pack containing an ultra rare, though there's no way to ensure that you'll get a Charizard ex out of it
And if thats not enough, you can cut the pair of Mutavaults for basic land or even Temples, but I have a feeling the mana is finally good enough to support them after all, I did play a Kessig Wolf Run in my G/R list last year
If Wizards removed cards from the Reserved List once thanks to "overwhelming public support," it seems possible that, with enough of a push from the community, it could happen again