All physical Planeswalker decks released between the October 2018 set Guilds of Ravnica and Core Set 2021 came with a one-time code to unlock their cards in MTG Arena, so you could use all the same ...

Typically, you would find specialized MTG Arena codes inside of purchased curated deck boxes for Planeswalker decks that unlocked those cards to then play online, which started back when the Guilds of ...