Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on synergy between cards. Make sure your cards work well together to create powerful combos and maximize their effectiveness. Don’t forget to include a good balance of creature cards, spells, and support cards to handle different situations during a match. And always keep an eye on your mana curve to ensure you have the right mix of cards to play at each stage of the game. Happy deck-building!