Hey fellow Planeswalkers! When building your deck in Magic: The Gathering Arena, always remember to have a good mana curve. Make sure you have a good mix of low-cost and high-cost cards to ensure you have plays in the early game as well as late game. Also, focus on having a clear strategy for your deck – whether it’s aggro, control, or combo. Lastly, don’t forget to regularly tweak and adjust your deck based on your gameplay experience. Happy dueling!