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As mentioned before, Hieratic Dragon of Nuit with Mausoleum of White and World Legacy Guardragon can roughly be done with Destudo the Lost Dragons Frisson, while Dragon Shrine can send Dragon Core Hexer to the GY and send The White Stone of Legend to the GY, letting you add Blue-Eyes White Dragon to your hand, then use it as the cost for Trade-In, so youll have multiple ways of quickly assembling the cards you need for your combo, which is quite good

Even Pokmon's mascot, Pikachu, has a promo card in the holiday sets , although it is disappointingly not very decorated

Or is is a special card

The three Admiral Manga Rares are OP-16's top value

I believe those have the most potential for growth other than gold stars in the next few years