Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, always consider your mana curve. Make sure you have a good balance of low, mid, and high-cost cards to ensure you have plays at every stage of the game. Also, don’t forget about card advantage – including draw spells or creatures with abilities that let you draw cards can give you the upper hand in longer matches. Lastly, always playtest your deck to see how it performs and make adjustments accordingly. Happy spell-slinging!