yugioh armor cards Yu-Gi-Oh! - Metalsilver (MFC-037) - Magicians Force - Unlimited Edition may be 1st or Unlimited Edition Rework of Valon's Armor cards

The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library." (2023-11-10) Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text

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This standardization also improves card shuffling during matches because cards move smoothly without catching uneven edges

And with that criteria the answer is clear

When attached to a Metal Pokmon card, that Pokmon takes ten less damage from the opponent's attacks