Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, remember the basics: have a clear win condition, maintain a good mana curve, and include a balance of cards for different situations. Don’t forget to include removal spells and card draw to keep your options open. Test your deck against different matchups to see how it performs and make adjustments accordingly. And most importantly, have fun experimenting with different cards and strategies to find what works best for you! Good luck out there on the battlefield!