They are a variant of the partner ability, and the commander needs to have the choose a background ability in order to put a background in the command zone
Nationals Came out of retirement in 2009, motivated to make himself worthy of Hall of Fame inclusion Earned his spot at Pro Tour-Honolulu via a Pro Tour Qualifier and promptly made the Top 8 in his first Pro Tour in several years After playing on the PT for 15 years he finally got the elusive victory at Pro Tour-Austin with Punishing Zoo Made the Top 8 in three of the first six Pro Tours since coming back to play at the highest level
In the case of Lilianas Standard Bearer, you have a 3/1 for three mana you can Flash onto the battlefield that lets you draw a card for each of your creatures that died this turn
Between the Doctor Who Commander decks, and The Lost Caverns of Ixalan soon releasing, Dinosaurs are definitely back in vogue
A tribal deck focusing on a specific creature type, such as Goblins, Elves, or Merfolk, would benefit greatly from using Door of Destinies as it can quickly boost the power and toughness of all creatures of that type
