Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, always remember to maintain a good balance between spells, creatures, and lands in your deck. Make sure your mana curve is smooth to ensure you have plays at every stage of the game. Don’t forget to include removal spells and ways to deal with different types of threats. And most importantly, playtest your deck to see how it performs and make adjustments accordingly. Happy brewing!