Just as I was writing up my overview of +1/+1 counter cards from the Golden Age, I was surprised by how many have an emotional impact on me as a player
For a more comprehensive dive into card grading services, this article has more information
No, they do not want to squint
That said, card grading requires a small to moderate learning curve, and it may be wise to consult an experienced submitter, check out a YouTube tutorial, or even ask questions in a Pokemon Facebook group before submitting a card(s) to a service
The new discover mechanic is one of the planeswalkers abilities where you can exile until you get a nonland card that is 4 mana value or less
These flaws are less impactful on value and are usually only factored in when having the card professionally graded