The choice was obvious because we had previously turned a carnival game into an Un- card
First off, only one exists and Dave and Adams Card World already has a $2-million bounty out for this one lucky person
If youre casting three or four non-creature spells in a turn and using Poppet Stitcher and Murmuring Mystic to also go wide, the djinn can give you a way to turn their tiny bodies into killing machines
Only 39 copies are believed to exist, making it a holy grail for collectors
In decks where you can amplify this damage like Torbran, Thane of Red Fell, I can see this pulling some weight, but I wouldn't run it aside unless you're really committed to Burn + Spellslinging
However, the populated army token won't automatically gain +1/+1 counters, so you'd need an anthem or some other way to give it toughness or it dies immediately