Dire Bare
Legend
Arena codes come with pre-release packs, starter sets, and some pre-constructed decks (the older planeswalker decks, but not the newer commander decks). They've been doing this for a while, a long while.I play arena a lot. The only time they've released a digital code for anything was with this latest prerelease.
Not a single pack of cards I have ever purchased ever has included a code for either mtg online or arena.