Database: card_games (difficulty: simple)
Question: Lists by ID all Creature-type cards with Legal status.
SQL: SELECT T1.id FROM cards AS T1 INNER JOIN rulings AS T2 ON T1.uuid = T2.uuid INNER JOIN legalities AS T3 ON T1.uuid = T3.uuid WHERE T3.status = 'Legal' AND T1.types = 'Creature'