Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one trick I always swear by is to maintain a good balance between card draw, removal, and win conditions. Card advantage is key, so include cards that allow you to draw more cards or generate additional resources. Additionally, make sure to have a good mix of spells that can deal with your opponent’s threats efficiently. Lastly, don’t forget to include win conditions that can help you close out the game effectively. By following these guidelines, you can craft a well-rounded deck that can take on any opponent in the Arena!