If the creature Audacity would enchant is an illegal target by the time the Aura spell resolves, the entire spell doesn't resolve
The top decks all lean heavily on artifacts: Delver and G/R (Swords), Wolf Run Ramp (Sphere of the Suns, Inkmoth Nexus, Solemn Simulacrum), Control (Ratchet Bomb and Pristine Talisman), and Birthing Pod, Grand Architect, and Tezzeret (obviously)
Just like Mulldrifter, this card comes with an Evoke cost that rewards the five-color Eldrazi strategy appearing in the Eldrazi Incursion deck
Although they function much the same as their regular counterparts, these cards feature shiny Pokemon rather than regular ones, making them highly desirable among players
While its restriction to only collecting low-power creatures can be awkward, you'd typically include Kiki-Jiki, Mirror Breaker alongside Imperial Recruiter, to trigger Recruiter's ability many more times