We are putting this ally to great use in our 4 mono-sphere Fellowship. It has good value for its cost, with a good attack value (that can even get up to 4 with Boromir's help) and a great Hit Points pool. Even if it's only confined to mono-Tactics decks its ability can be really useful as being able to engage enemies from the staging area (even if you would end up not killing or even damaging them) during the planning phase can be amazing. It can even kill some weak(ened) enemies on the spot, and you can do it for basically only 2 cost if you happen to have Mablung around. There are also other good timing combo I guess (like with Hirgon and Prince Imrahil after the Enemy attacks part of the combat phase).

I discovered a fun combo for this guy in a hero lineup of Hirgon, Mablung and Aragorn as follows:

• Quest successfully w/Hirgon and play the Knight for 2 resources (you may choose whether or not to give him +1 )
• Immediately engage an enemy, triggering the following: 1) Mablung gets a resource, 2) the enemy gets -1 , 3) Knight of Minas Tirith attacks for effectively up to 4/5

Best case scenario, you have eliminated an enemy by spending a net total of 1 resource and you now have a strong, durable ally on the table moving forward. Very fun for taking out Harbor Thugs and similar foes!