Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one trick I always keep in mind is to maintain a good balance between spells and creatures. Having a mix of both ensures that you have options in different game situations. Also, don’t forget to include cards that can deal with various threats, such as removal spells or counterspells. Lastly, always playtest your deck and make adjustments based on how it performs against different opponents. Happy brewing!