Hey fellow Planeswalkers! When building a deck in Magic: The Gathering Arena, always remember to have a clear strategy in mind. Start by choosing your win condition – whether it’s through creature combat, spell combos, or mill tactics. Then, make sure to have a good balance of cards that support your strategy, including removal spells, card draw, and mana ramp. Don’t forget to pay attention to your mana curve to ensure you have the right mix of early game plays and late game power. Lastly, playtest your deck against different matchups to fine-tune it for success. Happy brewing!