I used a 5-2-2-0-1 and found it was illegal. I still struggle to determine what is wrong with it. I am sure you have to have at least 2MC and any other A or D MC. I have seen 4-1-2-0-3 and it is not illegal. so how is 5-2-2-0-1 illegal?
You need 4+ players in the opponent's half of the field.