Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one trick I swear by is maintaining a balanced mana curve. Make sure you have a good mix of low, mid, and high-cost cards to ensure you can play something every turn. Also, don’t forget to include a variety of card types like creatures, spells, and enchantments to keep your opponents on their toes. And lastly, always playtest your deck to see what works and what doesn’t. Happy brewing!