Summary: It does not have to be Epic card to have interesting concept or mechanics. Let’s take a look at this simple common human character.
When we saw the Motar Canon, I brought up the attention to the fact Infinity Wars uses “Fortress” as keyword to indicate player’s health. This card demonstrates nicely the concept that is indeed the fortress. Field engineer simply fixes the your damaged fortress. Also, needless to say but this card also demonstrates the use of different zones in the Infinity Wars i.e. the ability only works if Field engineer is in the defensive zone.
By no means, super power, game changer but even this simple common card shows a great concept of the Infinity Wars.