Ritual decks...about time I made one of these articles. I'm only going to do a few rituals, because in reality most(read: almost all) aren't worth it. However, the few that are worth it are very strong cards when used in a deck built for them.
Please note that you shouldn't even attempt to make one of these decks until you own three Manju of the Ten Thousand Hands. Ritual decks CANNOT be successful without three of those.
FET has a nice Ritual Revival card: Contract of Fulfillment. This is a Premature Burial for Ritual cards only, which makes it very nice for these decks. The only difference between this and Premature is that if Fulfillment is destroyed then the Ritual monster is removed from the game. However, there are only a few m/t DESTRUCTION cards out there, so I'm willing to take that risk.