Database: card_games (difficulty: simple)
Question: Is there any card from Adam Rex artist in pauper format and available in paper? If so, indicate its ID.
SQL: SELECT T1.id FROM cards AS T1 INNER JOIN legalities AS T2 ON T1.uuid = T2.uuid WHERE T1.artist = 'Adam Rex' AND T2.format = 'pauper' AND T1.availability = 'paper'