Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one important tip is to carefully consider your mana curve. Make sure you have a good balance of low-cost and high-cost cards to ensure you have plays at every stage of the game. Also, don’t forget to include cards that can deal with a variety of threats, such as removal spells or counterspells. And always keep an eye on the current meta to make sure your deck is prepared to face the top strategies out there. Happy brewing!