I don't think that this card is there yet. The current 3 ally limit is a solid amount of allies to have on the table. Those allies are there to do a couple helpful items for a turn or two and then they will typically take one for the team and chump block for the hero when the villain attacks.

I think there will be a point in time or a specific super hero that has access to extra allies. Or there will be enough cheap allies that putting a couple out a turn or even three on a turn isn't unreasonable. Then this card will start seeing some play. But until then, this card should remain out people's decks at the moment.

This card works with requirements of having/exhausting SHIELD cards. Is cheap. Maria Hill (Hero) can include in her deck without bloating it as its gonna be only one copy. Does stack with other cards like Utopia and having allies now can passively give benefits (like by just having the SHIELD trait, example Organizational Support), or for a big boom like Avengers Assemble!, Blaze of Glory, Lead from the Front, or by having a swarm of AERIAL dudes that can be exhausted to pay cards or help other birds in your sky.