Batteryman C (DR04-EN030) - Dark Revelation Volume 4 Unlimited

If all Batteryman C(s) on your side of the field are in Attack Position, increase the ATK of all Machine-Type monsters on your side of the field by 500 points for each Batteryman C on your side of the field. If all Batteryman C(s) on your side of the field are in Defense Position, increase the DEF of all Machine-Type monsters on your side of the field by 500 points for each Batteryman C on your side of the field.