I don't think so, because combining cards that work well together, is just the thing to do.
So, for example, don't use this in a fractal devourer deck
Consider this, a pegasus double's his attack also, but only for 1 quanta.
The combining aspect is the idea of elements, and I don't think a card is overpowered if it works well with another card.
For example, take an otyugh, that is a strong card, however, no one will call it overpowered because you can eat a light dragon after using some plate armors.
But I just see I missed something, I place the old version: the effect was meant to be for 1 turn, forgot to edit that.