Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on synergy. Choose cards that work well together and support your overall game plan. Make sure to have a good balance between creatures, spells, and lands to ensure consistency in your draws. Don’t forget to include some removal and card draw to handle different situations. And always playtest your deck to see how it performs and make necessary adjustments. Happy brewing!