Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one important strategy is to ensure you have a good balance between spells and creatures. I recommend having a mix of removal spells, card draw, and of course, powerful creatures to dominate the battlefield. Don’t forget to pay attention to your mana curve to ensure you have the right amount of early game plays and late-game threats. And always remember to playtest your deck to see how it performs in different matchups. Happy dueling!