I didn't find any questions regarding card grading in here, I hope it's fine anyways.
I was browsing a secondary market today and noticed that Scrying Sheets underwent a price increase, probably because of Modern Horizons. I went through my collection and eventually found one. Now I'm not that experienced when it comes to grading. I mean I know when a card is near mint and when it's not but other than that i find it hard to distinguish the range from Good - Played. Since I wanna sell it I'll have to set a grade for it. My first guess was good but the damage on the bottom right corner makes me concerned.
By what criteria are Magic cards graded, and how would they be applied to this card?