Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to have a clear game plan. Whether you’re going for an aggressive rush deck or a control deck that grinds out the late game, make sure every card in your deck serves that purpose. Also, don’t forget about your mana curve – having a good balance of low-cost and high-cost spells ensures you have plays at every stage of the game. Lastly, always playtest your deck and make adjustments based on how it performs. Keep tweaking and refining, and you’ll be on your way to dominating the Arena in no time!