It's mostly defined mechanically by the one set that took place there, which meant going back to themes like instants and sorceries and pushing blue, as the flavor of education is core to the identity of Arcavios
10 Arcum's Astrolabe Arcum's Astrolabe might be the most unassuming broken card of all time
Im pretty skeptical, though
They're also given a solid color background, adorned with the Roman numeral of their associated game in white
Atarka, World Render Possibly the best Gruul dragon, and I challenge Wizards to come up with something better
Its also worth noting that in Hazduhrs surprisingly comprehensive lore, its stated above almost everything else that hes old, ill, and will probably be dead in a couple years