It was first introduced in 2010's Scars of Mirrodin MTG set, and its card list expanded further in releases like War of the Spark, Modern Horizons, and Phyrexia: All Will Be One
Bre of Clan Stoutarm Bre of Clan Stoutarm is a phenomenal lifegain payoff, especially big chunks of life per turn
That makes these starter decks and what they provide quite unique
At best you're casting her for just 1 mana which is awesome and her activated ability is amazingly-costed repeatable card selection/advantage
The flip to the back card seems like a bonus if the front already helped you attain Delirium
If you want to buff this Commander Deck, other cards that make artifacts hexproof and/or indestructible could certainly be very fun, as barring a board wipe, this would prevent most damage, and help to keep your Commander alive, and annoying