Auras were the least popular kind of card in competitive Magic for years (and maybe still are the least popular) because they are an obvious route to an opposing two-for-one
One of the main characters Sami, is on the hunt for their cat, for example
While this obviously pairs up well in most high-toughness matters decks, such as Doran, the Siege Tower, this card still will be a great curve-topper for almost any green deck with huge creatures and a decent amount of mana ramp
For just three mana, you give all your Dinosaurs haste, letting them attack in the turn you play them
These promos will also be more widely touted as a source of flavor and worldbuilding, allowing talented artists (or art directors) to define a chunk of the worlds visual flavor without restrictions
Being able to pick and choose how you clear the board and keeping your own higher mana value pieces intact without having to rely on the nuclear options like Farewell and Austere Command could prove beneficial as well