Ranging from a handfull of countermagic to mass removal and spot removal, this takes up a big chunk of the deck, granting me enough answers against more aggressive decks
Its not even needed, but it becomes a powerhouse once you flip this into The Great Work, allowing you to play spells from everybodys graveyard on a big turn before you get Urabrask back

Abuna Acolyte Adorable Kitten Adorned Pouncer Aetherstream Leopard Ajani's Chosen Ajani's Pridemate Ajani's Sunstriker Ajani, Nacatl Pariah Alacrian Jaguar Alms Collector Angelic Cub Arahbo, Roar of the World Arahbo, the First Fang Arcbound Mouser Arcbound Shikari Arcbound Slasher Arctic Nishoba Armored Guardian Armored Skyhunter Balan, Wandering Knight Bane-Marked Leonin Basri's Acolyte Bast, Panther Goddess Black Cat Black Market Tycoon Blade of the Sixth Pride Blistering Firecat Bola Slinger Bounding Felidar Brimaz, Blight of Oreskos Brimaz, King of Oreskos Brokers Initiate Bronzehide Lion Cait Sith, Fortune Teller Canopy Stalker Canyon Wildcat Cat Warriors Cat-Owl Cauldron Familiar Cave Tiger Chandra's Embercat Charmed Stray Chartooth Cougar Chrome Cat Chrome Prowler Civil Servant Coeurl Crazed Firecat Cruel Caracals Cubwarden Dawnwing Marshal Denry Klin, Editor in Chief Diamond Lion Displacer Beast Displacer Kitten Dreadmalkin Eager Glyphmage Elite Cat Warrior Emeritus of Truce Enduring Curiosity Enlightened Ascetic Entrails Feaster Envoy of Okinec Ahau Falthis, Shadowcat Familiar Felidar Cub Felidar Guardian Felidar Savior Felidar Sovereign Feline Sovereign Feral Maaka Feral Prowler Ferocious Tigorilla

You can take advantage of that as long as you plan to play multiple lands per turn, whether you mill yourself or sacrifice your lands for value
Overall, the deck felt like it might be pretty legit