The skill is useful but only to a small degree. This skill is only meant for beatdown decks. It is comparable to Banner of Courage and Graceful Dice due to the small ATK boost effect for every monsters on your side of the field. The biggest boost that you can get out of this skill is 300 ATK per monsters and only on your turn. Since this skill can be used once per turn, you can activate this on each of your turn to get the ATK boost after you have finished summoning your monsters. However, the fact that the ATK boost is not very significant still stands.