I don't like it simply because there are preexisting decks that AREN'T too powerful and utilize the fact that it could take one aether and two light quanta. These decks, while good at the moment, may not be impacted too terribly, but it would make them lose favor in the metagame.
Furthermore, the are some fun decks that COMPLETELY rely on that, like flying gavels. I don't want to have some deck archetypes taken away just so some card ideas that probably would never make it in game anyway (no offense, but there's such a volume of card ideas that the probability of a certain card or group of cards making it in game is low) aren't as OP.
If a person with an other card is worried about novas and such, maybe it shouldn't be in the "other" element? Couldn't you change the name and art while keeping the same effect and make it a different, single element? Cards in the element "other" aren't supposed to be terribly strong; their ease to play makes up for that. Or you could increase the cost of an other card so that novas and supernovas can still play it, but it isn't as great.