he's an NPC merchant you encounter that sells 'sets' of items each time you meet him for increasing prices (333, 444, 555, etc.)
Restless Bones is the lowest with -0.9792

Abandon the Post Abandoned Sarcophagus Abhorrent Oculus Abstract Performance Acorn Harvest Advanced Reconstruction Aerial Extortionist Alaundo the Seer Alex Wilder, Runaway All-Fates Stalker Aloe Alchemist Alrund's Epiphany Altar of Bhaal Alter Reality Ambush Wolf Amethyst Dragon Aminatou's Augury Amped Raptor Analyze the Pollen Ancestral Tribute Ancestral Vision Ancient Grudge Angel of the Dire Hour Angelfire Ignition Angelic Favor Annie Flash, the Veteran Annoyed Altisaur Anticausal Vestige Antiquities on the Loose Apex Devastator Apex of Power Appa, Steadfast Guardian Appeal // Authority Aquatic Alchemist Arc Blade Arcane Bombardment Arcane Heist Arcane Infusion Arcane Proxy Arcane Savant Archaic's Agony Archfiend's Vessel Archmage's Newt Ardent Plea Ardenvale Tactician Army of the Damned Arrogant Wurm Artful Dodge Artful Maneuver Arvinox, the Mind Flail Ashiok, Nightmare Muse Assert Authority Atraxi Warden Augury Raven Auron's Inspiration Aurora Phoenix Auspicious Starrix Author of Shadows Avatar's Wrath Aven Interrupter Azula, Cunning Usurper Back from the Brink Baron Helmut Zemo Bash to Bits Basking Rootwalla Battle Mammoth Battle Screech

A combined 83 total Anthousa and Jolrael players out there agree with me
You have kind of the opposite motivation to something like Sydri, where you want mana-intensive artifacts to animate
Considering you're already running a bunch more artifacts between ramp purposes and other Equipment you obviously want to include in your Equipment-themed deck, and you've got yourself a pretty heavy-hitting creature