Ruling Card Protector vs Stuff on the Back of the Card

[Empoleon_master]

As long as I have a card protector on the back of a card that has some marker on it and the card protector is opaque can I still play the card at a tournament? Also same question but with the edges of the card being roughed up or the back being pretty damaged in general but without creases on it so you could feel the back of the card.

 

[Rauthian]

In a tournament, the card and the sleeve are one. If the card can be examined in the sleeve without seeing little nicks and such from the back, that's fine. Sharpie marks though, will ALWAYS show through to some degree.