The Unswami by The Unknown Mentalist is a bundle of 4 ebooks of 84 pages available at Lybrary.com. A swami is an underused classic mentalist tool. There are numerous styles and types of swami gimmicks available. A typical use of a swami gimmick would be to write a two digit number of a business card, put the pencil away, and ask the spectator to name a two digit number. The card is shown to have the same two digit number just written by the performer. It is a classic and strong effect.
With The Unswami, you can show a sealed envelope, ask the spectator to name a two digit number, you or the spectator can open the sealed envelope, take out an index card from the envelope,
and written in ink on the index card that was sealed inside the envelope is the same two digit number. You cannot do this effect with a regular swami, but you can with The Unswami.