Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one tip I always swear by is to focus on a solid mana curve. Make sure you have a good balance of low, mid, and high-cost cards to ensure you can play something each turn. Also, don’t forget to include some removal spells and card draw to keep your options open during the game. And most importantly, playtest your deck against different opponents to see how it performs in various matchups. Happy brewing!