Dreams about valuable items, like the $1,500 Pokémon card, can symbolize aspects of your life that you value or wish to protect. The card itself may represent a hidden potential, talent, or opportunity that you recognize in yourself or someone close to you. Your action of providing a sleeve to protect the card suggests a nurturing instinct, indicating that you may have a desire to protect those you care about or to help them recognize their worth.

Furthermore, the fact that it came from a McDonald's Happy Meal could symbolize finding value in unexpected places or situations. It might also hint at the importance of playfulness and childhood joys in your life. Your advice to sell the card indicates a sense of practicality, suggesting you might be focusing on making the most out of opportunities that come your way.

Overall, this dream could reflect your awareness of personal value, the importance of protecting what matters, and a desire to help others recognize their potential. Consider what aspects of your life or relationships you feel need protection or acknowledgment right now.