The first Commanders added to Arena this way came from The Lost Caverns of Ixalan and you needed to play at a store's Commander Party to get the cards added to your account
However, I think some of these cards can find spots in other builds, and maybe you're out of the best removal in your color but still want some options, so its worth keeping them in mind when youre putting together something new
Can you see the card showing up in any tournament-level decks, or is it just a fun casual / Commander / Against the Odds card
Draconic attack action cards you control get +1POWER this turn
Every Transformer has a Robot front side and a Vehicle back side, with a new mechanic which lets you choose the side you cast (like MDFCs) while also transforming back and forth in play
As you'd expect, in-app currency is far more expedient and that means there's always the niggling suspicion that anyone shelling out in the Arena store will have better decks