Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, always think about your win condition first. Are you aiming to aggro your opponents down quickly, control the board until you can drop a game-ending bomb, or outvalue your opponent with card advantage? Build your deck around a clear win condition to increase its consistency. Don’t forget to include a good balance of removal, card draw, and threats in your deck to handle various situations. And most importantly, playtest your deck regularly to fine-tune it based on your performance. Happy brewing!