Since it combines 2 different abilities which also affect creatures of 4 different elements, this card is very strong, especially if used in duo and rainbow decks. I really think that as it is, it would be better as a spell card. On the other hand, that means that the boosting effect will be permanent since the card is used, something which doesn't happen with Nightfall for instance. Thinking again about the quanta cost I think it's ok as it is.