As has been suggested, max out the playsets of Champion and Honor of the Pure. I would also keep it monowhite and add 2 more Mirran Crusaders. The deck is very powerful after these additions. At DKA game day, my friends and I put Hold the Line with the following modifications in the hands of someone who had never played before (we taught him how to play that morning) and he went 3-2.

The best cards to cut for these changes are the Bonds of Faith and some of the equipment.