Water-types usually have abilities that manipulate energy cards or move Pokmon around on the opposing team
Its ability to transform and its narrative significance make it a standout character across generations, maintaining its presence in both competitive play and the broader Pokmon storyline
One can also utilize cards such as The Cauldron of Eternity or Tomb Trawler to guarantee that Grenzos ability is a hit

As far as the actual breakdown of cards in Foundations, were looking at 133 brand new cards that you can learn about through my colleagues expert reviews (linked above), joined by: 10 total full-art basic lands 70 borderless treatments (which are a mix of new cards and reprints) 60 cards in mana foil (which are the above borderless cards but, I dont know, fancier) 10 Japanese showcase cards (which are all reprints) 10 Fracture foils (the same ten cards from the previous bullet point, but sparkly) 46 extended art cards (these are all new cards, no reprints) 2 promos (Phyrexian Arena and Solemn Simulacrum, just to check these off now) 148 reprints (we will not be talking about all of them because I value my time and yours) 78 Beginner Box cards (which are also all technically reprints, though some are reprints of Foundations Jumpstart like Dropkick Bomber) 163 Starter Collection cards (again, all reprints, even Dawnwing Marshal, kinda) Got all that

Post-sideboard, we have quite a few options available to us depending on the type of creature matchup: Mono-Black/-White/-Red Aggro Decks: Out: 1 Doom Blade (If its black-based aggro) In: Hexproof Aggro: Out: In: 2 Deicide 3 Duress Boros Burn: This is by far our best matchup