Ok with this flavor the great general idea really makes sense. The question is: How many defeated unit do you want to enable the War Machine? Because the problem is: If it comes to early noone can beat it. 19 strength 3 movement is nothing you should get as early. Even if it's 100-150 units I wouldn't have a problem to get it very very fast before anyone has the chance to defend against it. We all know how many useless units the AI builds...