I'll make this my 2nd post here on T11
I'll say that Elevator is probably the easiest impromptu rising card. Ever. It's quite hard to find the actual notes to learn it, but if you watch a good performance of it, and actually try to work out a handling, you'll find it's not that hard to accomplish. It does NOT use a gaff of any kind.
Raise Rise is considered to be one of the most difficult effects in card magic. But don't let that scare you away from it! There's a really good sleight used in raise rise, called the Ambitious Riser Move which can be applied to alot of things, such as color changes, card controls, ACR phases.. the list goes on.
Hope this helped.