Much like with Persistent Petitioners and Shadowborn Apostle, these cards that allow you to run as many as you like are popular in Commander because it offers something different
Captain America, First Avenger The first wave of Marvel Universes Beyond products included commanders for some of the most iconic heroes in the franchise, including Captain America, First Avenger
I would only buy these playtest cards from trusted sources as they have the potential to be very easily faked
Cards with emerge let you sacrifice another permanent, usually a creature, and then play them for cheap, subtracting the sacrificed card's mana cost from the new card's emerge cost
I would still leave in the last Path to Exile for a Celestial Colonnade over bringing in a Disenchant, but depending on the list of U/W Control, I could see changing my mind there