Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one trick I swear by is to always keep your mana curve in check. Make sure you have a good balance of low, mid, and high-cost cards to ensure you have plays at every stage of the game. Additionally, don’t forget to include cards that can provide card advantage or help you control the board. And finally, never underestimate the power of sideboarding – having a well-prepared sideboard can really turn the tide in your favor during best-of-three matches. Keep these tricks in mind, and may your opening hand always be full of playable cards!