Luke Cage Buff

I like playing with Luke Cage in arena grinding, but as everyone knows, that's just about as far as you want to take him. I do believe that there is a simple buff that would make him more appealing for other areas of the game, and would really rely on the skill of the player. I love the fact that if you block or evade all hits, and the character you go up against hits their l3 you take no damage, but what I don't understand is how until indestructible is triggered you can take damage from blocking. If Luke Cage was buffed so that no damage was taken from blocking until the first hit, this alone would make him more appealing, and change his usefulness drastically imo.