Hey fellow Planeswalkers! When building a deck in Magic: The Gathering Arena, always start with a clear strategy in mind. Focus on a specific win condition and choose cards that support that goal. Remember to balance your mana curve to ensure you have plays at every stage of the game. Don’t forget to include some removal and card draw to maintain control and consistency in your deck. And most importantly, playtest your deck regularly to fine-tune it based on your gameplay experience. Good luck and may your opening hand always be full of land!