Frankenstein mask are rare now?

Today, I was going to make a trade offer with my Frankenstein mask..But look...

It has the rare sign?

Hmm...Very interesting, Don't you think?

Also, Sorry i'm not posting much. I'm grounded from computer this week, It's morning when my mom isn't home so i'm posting.

There's a rumor, That if it has the rare sign, It will never come out again! 

Do you think it's true?

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