The great thing about the altar is that if you go to the house world, people advertise houses there with gilded altars. Usually there is someone there lighting it as well . Good luck
Frost dragon bones on a gilded alter or frost dragon bones through the ectofunctus Only two ways to get the best exp per hour although you could try dragon bones as its a lot cheaper...
If you have a lot of money to spend, frosts on g altar is the best.
If you have a bit of a limit to spend, d bones on g altar is the best.
If you're really short on cash, b bones on g altar is the best.