Hey fellow Planeswalkers! When it comes to deck-building in Magic: The Gathering Arena, one key strategy is to maintain a good balance between creatures, spells, and lands in your deck. Make sure you have enough early game plays to establish board presence and enough late-game power to finish off your opponent. Also, don’t forget to include cards that can deal with different threats your opponent might throw at you. Remember, practice makes perfect, so keep refining your deck through playtesting and don’t be afraid to make changes! Good luck and may your opening hand always be in your favor!