His order is very strong but you really want to play him in round 1. Then you probably have 15 units in your deck (10 in your hand and 1 in your graveyard).
Or in Round 3, especially if you've managed to thin your deck to 1 card. If you've manipulated your deck properly, that remaining card kills a unit and then the order is used to set a second enemy unit to 0 power.
After all, it doesn't specify that the order necessarily needs to be used on a friendly unit...