The important bits such as the name and ability aren't obscured but the main problem with damaged cards is can you tell its different which is a feel thing. If you can't tell the difference when it's in a sleeve it's probably good.
When you take that card to a store or event, ask the head judge beforehand if the card is OK. It'll be at their discretion, and you may get a different answer depending on the judge or event. Have a basic land or something else ready to sleeve-in in it's place if they say no.
I was given a box of Magic Cards not long ago and this card was in the lot.
I'm wondering if it is playable? Please any help is appreciated!
[180 classic cube]