Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, remember that balance is key. Include a mix of creatures, spells, and lands to ensure you have options in different situations. Also, don’t forget to pay attention to your mana curve. Having a good distribution of low, mid, and high-cost cards can help you maintain momentum throughout the game. And lastly, always playtest your deck to see how it performs in actual matches and make adjustments accordingly. Happy brewing!