Solid card that can synergize with a lot of hero decks like Thor and Asgard trait or Avenger Leadership decks. It's a cheaper Helicarrier but more limited with the trait restriction. It can still be used in multiplayer with a call for action from another player. Also, you're not limited to a "Max 1 per player" restriction and can play up to three if you want. This doesn't stack with multiple copies to pay for the same single card.
Hero Action: Exhaust Team-Building Exercise → play a card from your hand that shares a trait with your hero, reducing its resource cost by 1.
This card came in the Ant-man pack, and honestly Ant-man is probably where it's best. Since he's an Avenger, as well as either Tiny or Giant, Team-Building has almost infinite targets, especially if you go the Leadership route with Avengers. Almost all his cards have either Tiny, Giant, or Avenger keywords, so it's really only the tech items that don't get a discount. With Avengers Leadership, you have a slew of Avengers you can play, as well as Avenger support cards, such as the Tower, Mansion, and the Quincarrier. I've been including 2 of them in order to see one early but not have too may dead cards, and it fires basically every turn. I'm hoping more Gamma cards come out so Hulk can get the same kinda love.