Deal - Standard 7 card stud setup (two down one up).
Standard 7 card stud deal and betting rounds. Four up cards, bet after each. Deal one down, bet. Showdown
Special Rules - Hearts:
Hearts - When a heart is dealt to a player as an up card that player may select any up or down card from another players hand and add it to their own.
Up cards remain up. Hole cards are chosen unseen and remain down. A player may look at their new hole card once it has been claimed.
https://www.pagat.com/poker/variants/passthetrash.html#heart
The player who takes a card must give the player a card in exchange: a face up card for a face up card or a face down card for a face down card. The player with the heart chooses what card to give back. It is even possible to give back the same card, for example if a hole card is taken and proves to be of no use.