Hey fellow planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on a cohesive game plan. Choose cards that work well together and support your overall strategy. Make sure to have a good balance of creatures, spells, and lands to ensure you can execute your game plan effectively. Don’t forget to include some removal and card draw to deal with threats and maintain card advantage. Lastly, always playtest your deck to see how it performs and make adjustments accordingly. Happy brewing!