Hey fellow Planeswalkers! When it comes to deck-building in MTG Arena, always remember to have a good balance between spells, creatures, and lands. Make sure your mana curve is smooth to ensure you can play your cards efficiently. Don’t forget to include some removal spells and card draw to keep your options open. Experiment with different strategies and card synergies to find what works best for you. And most importantly, have fun dueling in the Arena! Good luck, and may your opening hand always be a keeper!