Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to focus on synergy. Make sure your cards work well together to create powerful combos. Also, remember to balance your mana curve to have a mix of low-cost and high-cost spells for a smooth gameplay experience. Don’t forget to include some removal and card draw spells to handle different situations. Keep tweaking and testing your deck to find the right balance for your playstyle. Good luck on the battlefield!