Hey fellow Planeswalkers! When building your deck in Magic: The Gathering Arena, always remember to have a good balance between creatures, spells, and lands. Make sure your mana curve is smooth to ensure you have plays on every turn. Don’t forget to include removal spells and card draw to handle threats and maintain card advantage. Lastly, playtest your deck against different matchups to fine-tune it. Good luck and may your opening hand always have the perfect mix of cards!