So, you paid 2ER for this card's effect. Lets say you did it with Supernova Helmet so it technnicaly becomes 1ER (the card in hand by itself).
Now, we must assume that it was played because you have at least one secured minion or shcheme to be defeated. your base ATK/THW is 1, meaning you have problems to do that without the help of other cards like Heroic Intuition or Pot Shot.
In the end, you need a big amount of preparation, right cards in hand and enemies/schemes in the right moment, for the most iconic card of Nova, to become quite powerful as it seems. And even if so, you will be probably depending on what you draw with it, to continue doing not-so-powerful actions as expected