Hallowed Tomb

Q: What about a different card with the same Champion tag? If Jinx, Rebel is my Chosen Champion, can I get back a Jinx, Demolitionist, because Jinx is my Chosen Champion?

No. You can only get back a card with the exact full card name of the one you chose at the start of the game.

Q: Can this card only return the specific card I picked as my Chosen Champion? What about another copy of the same card?

You can return another copy of the same card. Hallowed Tomb refers to “your Chosen Champion,” but it’s quite possible that you won’t be able to verify whether a card in your trash is the specific card you chose. For example, your Chosen Champion might have been played, returned to your hand, and then discarded; you wouldn’t be able to prove to your opponent that it wasn’t another copy of the same card. Because of this, the updated rules treat all copies of the card you designated as your Chosen Champion as interchangeable.