Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one important tip is to maintain a good balance between spells, creatures, and lands in your deck. Make sure you have a clear strategy in mind and choose cards that work well together to support that strategy. Don’t forget to include some removal spells and card draw to handle different situations during a match. And of course, always playtest your deck to see how it performs and make adjustments accordingly. Happy deck-building!