It still verges towards the casual side of thingsafter all, its a 4-mana spell that requires two more turns to workbut it sets up nice turns
No quick glances for bold keywords on this
Bruvac the Grandiloquent was previously only accessible as a Jumpstart card, making it difficult to get ahold of for the average MTG player

Abigale, Eloquent First-Year Abigale, Poet Laureate Akim, the Soaring Wind Ambrosia Whiteheart Balmor, Battlemage Captain Bartz and Boko Breena, the Demagogue Choco, Seeker of Paradise Commander Eesha Derevi, Empyrial Tactician Dragonhawk, Fate's Tempest Esior, Wardwing Familiar Falco Spara, Pactweaver Falcon and Redwing Falcon, Joaquin Torres Francisco, Fowl Marauder Gwaihir the Windlord Gwaihir, Greatest of the Eagles Hakka, Whispering Raven Imbraham, Dean of Theory Ishai, Ojutai Dragonspeaker Ishai, Ojutai Dragonspeaker Kangee, Aerie Keeper Kangee, Sky Warden Kastral, the Windcrested Koya, Death from Above Kykar, Wind's Fury Kykar, Zephyr Awakener Landroval, Horizon Witness Lieutenant Kirtar Maha, Its Feathers Night Major Teroh Mavinda, Students' Advocate Meneldor, Swift Savior Moira and Teshar Moseo, Vein's New Dean Nadu, Winged Wisdom Scriv, the Obligator Senu, Keen-Eyed Protector Shabraz, the Skyshark Shaile, Dean of Radiance Syr Cadian, Knight Owl Teshar, Ancestor's Apostle The Goose Mother Vega, the Watcher Wan Shi Tong, All-Knowing Wan Shi Tong, Librarian Yorion, Sky Nomad Zinnia, Valley's Voice

While only affecting a single creature type restricts Cavern, typal decks can leverage this to ensure their threats get through countermagic, be they efficient merfolk, monstrous dinosaurs, or sneaky goblins