Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, focus on a clear game plan. Choose cards that synergize well together to increase your chances of victory. Remember to maintain a good balance between creatures, spells, and lands in your deck. Don’t forget to include some removal and card draw spells to handle different situations. And most importantly, playtest your deck regularly to fine-tune it for optimal performance. Happy building and may your opening hand always be in your favor!