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Mini Hanging Scroll

Conclusion Crystron is definitely a viable deck even without the support of the K9 cards

Once per turn, when your opponent activates a Spell/Trap Card or effect (Quick Effect): You can send 1 Spell/Trap you control to the GY

This kind of effect is nice to have access to, but unless we find something like Phrexian Dreadnaught that asks you to build a deck around countering your own trigger, I cant imagine that youre really going to put this card in your deck if your plan is to use this side of it over 80% of the time

Pre-release Raichu, however, is so rare, that many collectors believed the card didn't actually exist, and was nothing but an urban legend