I have the Magic Origins legendary Jace emblem. How would this card be added to my inventory? Secondly how is this card played?

https://deckbox.org/mtg/Emblem:%20Jace?printing=28483 Emblems aren't played like regular cards. While they technically can be added to decks here on deckbox that's not how they are used in real life. They function the same was as tokens. They don't take up slots in your deck or sideboard or anything, just bring them with you when you're playing a deck that can produce them.