Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one tip I always swear by is to focus on synergy. Make sure your cards work well together and have a clear strategy in mind. Don’t just throw in powerful cards randomly – think about how they can support each other. Also, don’t forget to have a good balance between spells, creatures, and other card types to ensure you have options in different situations. And lastly, never underestimate the importance of mana curve – having a good spread of low to high-cost cards can really make or break a game. Happy brewing!