From YouTube comments: “At about 0:25 he splits the deck and pockets cards. Probably everything but her card and hearts. Then he asks her for a suite – if she named hearts he’d say he got rid of everything buy the suite she named. She named clubs, so he says ‘gone’. Then the next time she names hearts – and he ‘keeps’ them.” You’ll also see he is with @summertomato (good for them).
David Blaine makes a deck of cards shrink