Talk:Hateful Genesis/@comment-79.117.80.31-20130427075856/@comment-1321146-20130427092029

As it says, it weakens the ATK of your opponent's Genesis (in this case) cards.

It is impossible to tell if this will be useful without looking at the specific fight. If you are fighting an opponent with few or no Genesis cards, it could be an idea to swap any card you have in your deck with Hateful Genesis.