Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on a theme or synergy. Whether it’s tribal decks, control decks, or aggro decks, make sure your cards work well together to maximize their effectiveness. Also, don’t forget to keep your mana curve in check to ensure you have the right balance of low and high-cost cards. Lastly, always playtest your deck to see how it performs and make adjustments accordingly. Happy brewing!