He was asking 10 for a small stack, and I couldn't spend that much not knowing what they were
It lets you practise against Magic: The Gathering Arenas AI without having to worry about real-life players destroying you with fancy decks
We also run powerful support cards to close out games like Chandra's Incinerator turning all ping damage into creature removal, Laelia, the Blade Reforged growing into an enormous threat with Ob's exile draw, turning Ob into a 1-shotter with Temur Battle Rage, and protecting him from removal with tons of cards like Armor of Shadows
This is big news for the Brawl community, and it could have ramifications for MTG Arena in general going forward
One of the quirks of the Commander rules is that if a mana symbol appears in the casting cost or in the text box of a card, the color of that mana symbol contributes to the card's "color identity." So if you used Ishkanah, Grafwidow as your commander, you could include green or black cards in your deck