Synthoids Aang and La, Ocean's Fury Aang's Iceberg Aang's Journey Aang, Destined Savior Aang, Master of Elements Aang, Swift Savior Aang, at the Crossroads Aang, the Last Airbender Aatchik, Emerald Radian Abandon Attachments Abandoned Air Temple Abandoned Campground Aberrant Manawurm Abhorrent Oculus Abigale, Eloquent First-Year Abigale, Poet Laureate Abomination, Terrifying Titan Abrade Abraded Bluffs Absolute Virtue Absolving Lammasu Absorbing Man Abstract Paintmage Abuelo, Ancestral Echo Abyssal Gorestalker Abyssal Harvester Abzan Devotee Abzan Monument Accumulate Wisdom Aclazotz, Deepest Betrayal Acolyte of Aclazotz Acrobatic Cheerleader Acrobatic Leap Action News Crew Adagia, Windswept Bastion Adamant Will Adaptive Automaton Adaptive Gemguard Additive Evolution Adelbert Steiner Ademi of the Silkchutes Adept Watershaper Adorned Crocodile Adrenaline Jockey Adventurer's Airship Adventurer's Inn Adventuring Gear Adventurous Eater Aegis Sculptor Aegis Turtle Aerial Doombot Aerith Gainsborough Aerith Rescue Mission Aether Syphon Aetherize Aetherjacket Aettir and Priwen Affectionate Indrik Afterburner Expert Aftermath Analyst Agate Assault Agate-Blade Assassin Agatha of the Vile Cauldron Agatha's Champion

Of course, players can still mix and match cards from all sets as long as a deck has no more than two inks represented
Gauntlets of Light and Magewrights Stone will probably be essential
Making sure you're not a bot
But where do you even start