A lot of people who play the Yu-Gi-Oh card game don’t play by the rules. They will do anything to win and that includes cheating or “creating” new rules. This is called YGO Spoofing, so yes, Spanish Yugioh cards are worth something if they are cards that have been spoofed with a new rule set on them - if they use real cards with spoofed rules on them then they aren’t worth anything.