An archetype-specific card, but a solid synergy piece/build-around in that archetype. Are you running a critical mass of Into the Fray, Relentless Assault, Moment of Triumph, and Hand Cannon? Possibly on a hero with built-in cards with overkill (Rocket's Particle Cannon, Thor's Hammer Throw), or which already synergize with some of those (Ms. Marvel's Embiggen)? Include Follow Through and go to town.

Example Thor deck: marvelcdb.com

The obvious comparison to including this card is if you had 3 First Aid cards. This is definitely the better value. For 1 card, you can accomplish what it takes 3 cards in a non-protection deck to do. Furthermore, because using First Aid requires 3 cards, as opposed to one for Med Team, it costs 6 effective resources (3 to pay for each of them and 3 for the cards themselves) to heal 6 total damage vs. 4 for this one. I haven't played Protection much but I'm going to be trying it out again soon with a Thor deck and am eager to see how this fits in with it.

This is a truly fantastic card. On the turn you play it it costs one resource (itself) to heal one. If you never used it again that would be OK value. But in fact every turn you go into Alter Ego it will heal another one and draw a card out of your discard pile. You can use that card to pay for something, or hold on to it for your next turn, if it is a particularly useful event.

Then every turn you start in Alter Ego it will heal one and increase your hand size. Other than when you mulligan, you can't do much to curate the cards on the bottom of your discard pile but the healing and increased hand size alone are incredible. I would say this card is up there with Aamir Khan.

As many others have already noted for some of Star-Lord and Gamora cards, this card actually cost 3, not 4. At 4 cost it is largely unplayable, and at 3 cost is a niche card that probably won't see much use outside, although the ability to split is nice. Compared to Inconspicuous and Giant Help, which cost 1 and 2, and remove 3 and 4 threat, respectively

This is an auto-include for Thor. Another 0 cost card to proc "Have At Thee!" along the lines of Defender of the Nine Realms with the upside of a 3 health, 2 attack ally. She is also tutorable with For Asgard!. Angela could also be useful for other decks running cards like Into the Fray who want to have a legal minion target most turns.