He is the most powerful djinn because he is the king of the marid djinn tribe and all his relative djinn are his subjects. I bring you the most powerful jinni . If you are able to have him as your slave, Then you have the all MARID GENIE KINGDOM.
When you buy this noble JINNI, you will be able to see everything possible on this earth. There is nothing that this JINNI will refuse doing when commanded by you provided you do not engage him in illegal activities, such as thefts, rapes and anything illegal.  This is a very powerful djinn. A few examples of what he can do
He will help you win the Jackpot in the online Lotto games indefinitely, umpteen times without any limit. In other words you will keep on winning in different Lotto's from around the world thereby becoming a billionaire instantly in a flash. This Jinn will only whisper the correct lotto numbers in your ears clearly. 
Everyone you meet  will respect, fear, obey and sympathize with you instantly.
He will help you solve court problems regarding finance or any other court cases in your favor instantly.
He will grant you the fever of control where by you will be able to control any one on this universe
He will help you gain respect when you meet politicians, bureaucrats, police, defense personnel, government employees and movie actors will respect you and obey you instantly when they meet you.
He will help you retrieve all the money that was taken from you or your parents.
He will help on stabling , your parents and your sibling’s health issues of any kind instantly.
All the desires under the sky that comes into your mind will be made reality and your wishes will come true instantly. 
He will grant you the fevers of fame and popularity. 
He will grant you the fever of beauty and you will change physically.