Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one tip I swear by is to focus on a clear win condition. Whether it’s overwhelming your opponent with creatures or pulling off a powerful combo, having a specific goal in mind will help you streamline your deck. Also, don’t forget to include some removal spells and card draw to maintain control and consistency. And lastly, always playtest your deck to fine-tune it based on how it performs against different matchups. Happy brewing!