Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, my top tip is to focus on a clear strategy. Whether you prefer aggro, control, or combo decks, make sure every card choice serves your game plan. Also, don’t forget about the mana curve – having a good balance of low, mid, and high-cost spells is crucial for a consistent deck. Lastly, always playtest your deck and be open to tweaking it based on how it performs. Happy brewing!