Outside of perhaps the alternate commander Sophia, Dogged Detective, you can play with Deep Clue Sea as-is and be able to hold your own against many other decks
They feel like they want the card as a four-of, but really it'll likely be closer to a two-of for now as people try it out
Prices pulled directly from TCGplayer highlight a few essential trends: Icon cards dominate : Holo raritiesespecially Charizard, Blastoise, Venusaurcommand huge premiums due to their nostalgia, limited old print runs, and iconic artwork
Cephalid Vandal Shred counters for an ability that churns through your library sounds like it belongs in an Un-set
He debuted as the leader of his preconstructed Mono-Red deck
Then regarding Spanish cards, they are printed in the US and The Netherlands (so made by Millenium Print Group and Millenium Print Group Europe), so you are right that they are not printed in Belgium by presumably Cartamundi and thus wont have those filler cards