Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one important tip is to have a clear game plan in mind. Whether you’re going for an aggressive strategy or aiming for a late-game win, make sure your cards work towards that goal. Also, don’t forget to maintain a good balance between spells, creatures, and other card types to ensure versatility in different situations. Lastly, keep an eye on your mana curve to make sure you have the right balance of low and high-cost cards for a smooth gameplay experience. Happy deck-building!