Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on synergy between your cards. Choose cards that work well together and support your overall game plan. Don’t forget to have a good balance between creatures, spells, and lands to ensure you can play your cards consistently. Also, make sure to pay attention to your mana curve to have the right mix of early game plays and late-game finishers. Keep practicing and experimenting with different card combinations to find what works best for your playstyle! Good luck out there on the battlefield!