Collectible Card Game Headquarters

I was playing against an AI the other day, and it attempted to block my attack, but it blocked a creature that would have dealt significantly lower damage. It had no chance of killing either, just block some of the damage: why would it not pick to block as much damage as possible?

The AI is very dumb when it comes to combat. I've tried to code for all situations but that is very impossible. Maybe in the future the AI will be better.