pokemon sylveon ex card #RC32 EXTENDED ART – Raycardza one starter set! Question about the new Sylveon

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Card Name Squall, SeeD Mercenary Mana Cost Type Legendary Creature Human Knight Mercenary Rarity Rare rules Text Rough Divide - Whenever a creature you control attacks alone, it gains double strike until end of turn.Whenever Squall deals combat damage to a player, return target permanent card with mana value 3 or less from your graveyard to the battlefield

Then there are potential companions that theoretically could work with a partner pair

So what are these serialized cards

This is where things get a bit tricky