You want to have -less- quanta, not more quanta((Opponent-Yours)/4). Mono dark generally makes use devourers, with give you more quanta and subtract from your opponent. I suppose you could use it in a deck that eats up your darkness very quickly and doesnt affect your opponents supply, but it just feels weird to me. Now in mono death as is, or if it were changed to another element, yeah fine. Other than the name of the weapon, it fits aether fine, and aether eats up its quanta quickly.