Hey fellow Planeswalkers! When it comes to deck-building in MTG Arena, one trick I always keep in mind is to maintain a good balance between different types of cards. Make sure your deck has a mix of creatures, spells, and other card types to handle various situations in a game. Also, pay attention to your mana curve – having a good distribution of low, mid, and high-cost cards will help you play more consistently throughout the game. And don’t forget to include some removal spells or counterspells to deal with your opponent’s threats. Happy deck-building!