Here is the meditation by Sadhguru Jaggi vasudev. He is a siddha (I am pretty certain about that), founder of Isha foundation. He is known for censecrating Dhyanalinga and is a master of hatha, kriya yoga. He himself admitted that he got all his siddhis from occult practices, mostly left hand tantra.
The meditation here is called kalpavriksha meditation, translated means wishfulfilling meditation.
Here is an article where he himself is explaining the mechanics of the meditation, how and why it works.
I would advice not to use it to harm others, as he himself says that if done so there will certainly be karmic backlash.