Hey fellow Planeswalkers! When building your deck in Magic: The Gathering Arena, remember to maintain a good balance between creatures, spells, and lands. Make sure your mana curve is smooth to ensure you have plays at every stage of the game. Don’t forget to include cards that can deal with different threats – like removal spells and counterspells. And most importantly, playtest your deck to see how it performs against different matchups. Keep tweaking and improving, and may your opening hand always have the perfect mix of cards!