Hey fellow Planeswalkers! When building your deck in Magic: The Gathering Arena, always make sure to maintain a good balance between your mana curve and card synergy. Include cards that work well together and have a mix of creatures, spells, and other card types. Also, consider the current meta and adjust your deck accordingly to stay competitive. And most importantly, playtest your deck to see how it performs and make necessary tweaks. Good luck and may your opening hand always have the perfect mix of lands and spells!