You can either look at your opponent's hand and sift out one of their cards (also giving them a new card on draw, but that usually doesn't hurt too much), or you can use it on yourself, and filter through your hand a bit and draw yourself
Wizards of the Coast released 24 Commander preconstructed decks in 2022, which is a significant departure from the first decade of Commander precons
Head down below for gigantic images and more information on all of these
Blue-Purple Luffy can look at the top five cards of the deck, add one of his crewmates to his hand, and then put the remaining cards back in any order on top or bottom
Skullport Merchant is similar, giving us a way to make a Treasure and also sacrifice some of our less powerful creatures for value, while also putting a 1/4 body on the battlefield, which makes it a really solid blocker against aggro