system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: David Blane's card trick where the card the victim guessed ends up in pocket, wallet, etc.

It's a pretty amazing trick where he hands a real deck to the victim, has them do random nonsense (move deck around, split deck, etc.) and then asks them to pick a random card. The card then appears in the victims wallet, under their watch, or in their pocket. Also would like ice pick through the hand with no blood explained. When the doctors X-rayed the ice pick and it was real my mind was blown.
gpt
The mark, if real,  would likely have been reverse pick pocketed before the trick. Slight of hand can explain how he knew the card to put in. He shows a real deck, has them cut the real deck, then fidgets with his hands, shows you there's nothing under his (short) sleeves by touching them, lets his hands fall to his waist, you get the picture. At this point the real deck is swapped out for the gaff deck that only has the card type he put in their pocket earlier. Signatures? Their credit card has them. Behind plate glass? Anybody could have put it there, same with any other of those gimmicks. The trick is making you think the card you choose  has meaning, but all it means is the magician now has 53 decks missing it.