Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, remember to include a good balance of spells and creatures in your deck. Also, don’t forget about your mana curve – having a variety of low, mid, and high-cost cards will help ensure you have plays at every stage of the game. And always keep an eye out for new card synergies or combos that can give you an edge in battle. Happy brewing!