If that card has been reprinted in a set that has the standard legal regulation letter, then you can continue to use that art/version of the card
Sure, Dimensional Storm is a great move, but it requires four energy to use, and then you have to immediately discard three of them, a brutal restriction that forces you to use your much weaker slash attack for the next few turns
Maxx C just shits all over decks like Lunalight, Dozer Control, (Infer)Noble Knights etc etc
Then, screaming your Pokmon's attacks at the top of your lungs and optionally impersonating the Pokmon's cry as well, you launch a fierce assault on your opponent's Defending Pokmon, before it's their turn and they respond in kind
With Ivy, you generally build it as a very different Voltron-style deck, casting a bunch of enchantments and single-target spells and turning them into two-for-ones by making sure you target someone other than Ivy