Excellent card when you don't plan to use your hero activation. Also the no consequential damage open a space for new cards to shine. For example Pixie (cheap 2 cost ally) normally can attack only once for 2. With that card she can atleast hit for 3 and will be ready for more next turn. Even something small like Ant-Man (Hank Pym) can be very good only for 1 resource. With that in mind this card is already very good, and will be better the more cardpool grows.

Rank (A-C) B+ Good in many decks, do not include when you plan to use your hero basic power frequently

While the average case for this card is healing an ally for a point or two of damage, this card makes an exceptional combo with allies that attack multiple enemies: Dust, Thor, and Two-Gun Kid. Since these are Aggression allies and Unified Strike is a Leadership card, only a few heroes can pull it off solo (Adam Warlock, Spider-Woman, and Wonder-Man), but multiplayer team can easily make it work.

At first I thought this card was essentially the same as Teamwork.

But now that I think about it, this card can be used to boost your ally's ATK or THW even if your hero is Stunned / Confused.

Could prove to be handy.