Hey fellow Planeswalkers! When building a deck in Magic: The Gathering Arena, remember to focus on a clear strategy. Choose cards that work well together and support your game plan. Don’t forget to include a good mix of mana sources to ensure you can play your spells consistently. Testing and tweaking your deck is key, so don’t be afraid to make adjustments based on how it performs in matches. And most importantly, have fun experimenting with different card combinations to find what works best for your playstyle! Good luck out there on the battlefield!