Classical Marvel Champions support card. Big cost (4ER) at the start, and not significant bonus from the start (usually you in time you play you got 1 or 2 ally at most). But the longer the game is, the more value this card gains. For baseline ratio 2 damage per 1 resource you will get the value after 8 uses of ally. In the end of 2025 (after realease of Civil War) you can create many interesting decks with allies focused only on attacking.

Rating (A-C) B Requires plan to make it functional, but create a special archetypes of attacking allies (not blocking). On it's own Boot Camp is too slow.