Nobody has found the rules

No rulebook, insert or printed instruction for this set has ever been found, and neither has a pack or an album that might have carried one. What follows is what the cards themselves imply, marked as inference rather than fact.

What is printed

Every card carries two numbers in a bar across the top: Ataque and Defensa. Attack runs from 500 to 2500 and defence from 520 to 2300, and on all twenty-seven cards the two move together — a card with a high attack has a high defence. There is no cost, no life total, no text box, and no card that modifies another.

What that suggests

Two numbers, no interaction, and a set small enough to carry in a pocket is the shape of a comparison game rather than a trading card game: two players reveal a card, one stat is called, the higher number takes both. Top Trumps has worked that way since 1978. The border bands would then do the work of rarity — a red card beats almost anything, a yellow card almost nothing.

That is a reading of the artefact, not a rule we have seen written down, and we would rather say so than invent a game. If you have a pack, a wrapper, an album page or a magazine that explains how these were meant to be played, it would close the single biggest gap in this set’s record.

The referee

One card sits outside the pattern. #20 Arbitro still carries Ataque and Defensa, the lowest pair in the set, but its single field reads “Controla y vigila los combates entre bladers” — he controls and watches over the battles. Whether that was a playable card or a joke about Blader DJ is not known.