Focusing on artifact-specific untappers may help out your curve

Abaddon the Despoiler Abdel Adrian, Gorion's Ward Absolute Virtue Abzan Guide Abzan Kin-Guard Academy Raider Accursed Marauder Adder-Staff Boggart Agent Frank Horrigan Ahn-Crop Champion Ahn-Crop Crasher Ahn-Crop Invader Ainok Strike Leader Ajani, Nacatl Pariah Akiri, Fearless Voyager Akki Avalanchers Akki Ember-Keeper Akki Lavarunner Akki Raider Akki Underling Akoum Boulderfoot Akoum Warrior Akroan Line Breaker Al Bhed Salvagers Alesha's Vanguard Alesha, Who Laughs at Fate Alesha, Who Smiles at Death Allosaurus Rider Alpine Houndmaster Ambassador Oak Anep, Vizier of Hazoret Angel of Indemnity Anthousa, Setessan Hero Arashin Foremost Arashin Sunshield Archetype of Aggression Arctic Nishoba Ardbert, Warrior of Darkness Ares, God of War Armored Skaab Armory Veteran Ash Zealot Ashenmoor Cohort Ashenmoor Gouger Aspiring Champion Assault Intercessor Astelli Reclaimer Astor, Bearer of Blades Atarka Beastbreaker Atarka Pummeler Attuma, Atlantean Warlord Aurora Champion Avalanche Tusker Aven Eternal Aven Gagglemaster Aven Initiate Aven Reedstalker Aven Skirmisher Aven Sunstriker Aven Wind Guide Avenger of the Fallen Avenging Huntbonder Axegrinder Giant Axgard Braggart Azra Bladeseeker Azra Oddsmaker Backwoods Survivalists Baldin, Century Herdmaster Ballroom Brawlers Banewhip Punisher Barktooth Warbeard Barkweave Crusher

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See also References Okay, so TECHNICALLY they'd previously done so with the Arabian Nights expansion, based on a classical work of literature, and Portal: Three Kingdoms , based on real-world Chinese history but you know what we mean