Hey fellow Planeswalkers! When building a deck in Magic: The Gathering Arena, always consider your mana curve. Make sure you have a good mix of low-cost and high-cost spells to ensure a balanced gameplay experience. Also, don’t forget to include cards that can deal with different types of threats, whether it’s creatures, enchantments, or artifacts. Lastly, playtest your deck against different opponents to see how it performs in various matchups. Good luck and may your opening hand always have the perfect mix of lands and spells!