Hey fellow planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one trick I always keep in mind is to focus on a clear win condition. Make sure your deck has a specific strategy or combo that you can build towards. Also, don’t forget the importance of mana curve – having a good balance of low, mid, and high-cost spells can make or break your game. Lastly, always playtest your deck to see how it performs and make adjustments accordingly. Happy brewing!