Trafalgar Law (119) (Manga) - Royal Blood (OP10)

I can't tell what it is but it looks like someone left fingerprints on it.

Can only see it at a certain angle.  

[On Play] Reveal up to 1 "Supernovas" type Character card from your hand and add it to the top of your Life cards face-down. Then, give up to 1 rested DON!! card to 1 of your "Supernovas" type Leader.