It's essentially a Goblin Oriflamme effect, which has proven to always be usable given the right cost and setup
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
, : Exile another target creature you control, then return it to the battlefield under its owner's control
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In other news, it says here that Brago will probably see too much Commander play over the next few months, and expect to see so much of him that your throat will explode into a vomitous mass in dread of Commander night at your local game shop
See rule 117, Timing and Priority. The ability becomes the topmost object on the stack