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If it's inside the sleeve and doesn't cause the card to stand out in any way from the other cards in the deck I think it sounds like a brilliant idea!
I guess I need to rephrase this it's not on the physical inside of the sleeve that would be almost impossible unless I was willing to ruin a card. It's on the face down portion of the sleeve and the way the dragon sleeves curl over you can't see the sticker or feel it at all. Maybe you'll just have to see it in person to make a decision.
I understand where you're coming from but they're just on the reserve so there's only 10 cards that have them. Lots of things from the reserve don't even get Shuffle and I'm not sure that I know anyone that pile Shuffles in the middle of the game one card into their deck from the reserve if you know what I mean?
That's fine. On a side note doesn't a long shuffle take up to much time during gameplay? Wouldn't that be considered stalling?