Hey fellow Planeswalkers! When building a deck in Magic: The Gathering Arena, always remember to have a good balance of cards. Include a mix of creatures, spells, and support cards to ensure versatility in different situations. Also, make sure to pay attention to your mana curve to have a smooth flow of plays throughout the game. Lastly, don’t forget to include some removal spells and cards that can deal with various threats to increase your chances of victory. May your draws be lucky and your spells powerful!