Star-Lad

Iron Lad is here, and he's a... Guardian? Use Star-Lord's ability to grant Guardianship so the cheapest high-ATK allies can be buffed with Energy Spears. Then, leverage Iron Lad so they don't have to take consequential damage.

She-Hulk is the only added ally that doesn't fit the "cheap" description, but I think she's a good fit for the deck. She can thwart for 3 with Leader of the Guardians, attack big with an upgrade attached, and then have a base 4-ATK stat to take advantage of with Iron Lad.

The main target for First Aid should be the Lad once he's out since his health basically counts for double with his ability.

For the upgrades, we've also got Enraged and Sidearm. You probably only want to use Enraged on allies last activation, and I'd say at least one Iron Lad activation makes it worth playing. Sidearm can be thrown out anywhere, but is especially valuable on Iron Lad himself since you should be doing your best to keep him alive.

Boot Camp is a no-brainer here, as it adds a ton of value to all of the ally activations. Also, your allies will be doing the vast majority of your damage, so War Room is a good include to get some consistent, albeit small, thwarting.

The main target for First Aid should be the Lad once he's out since his health basically counts for double with his ability.

I'd recommend this deck primarily for multiplayer, as it's heavily focused on damage and isn't particularly great at thwarting. That being said, it can probably hold its own in Standard games if you throw in some hero healing like Precision Strike and prioritize getting out Leader of the Guardians. If you want to take out cards for that, the non-spear attachments are probably your best bet.

Another suggestion for deck-building would be to build a Leadership version of this. Comms Implant, Inspired, Sky Cycle, and a smattering of Leadership Avenger allies could definitely make for a fun time with Iron Lad as well!