The creature featured in Subtlety is a great, albeit somewhat petrifying concept, and the imagery does well to bring it to life
While the obvious first home for Urza's Cave is Tron decks as a failsafe for games where it's difficult to assemble the three Urza lands necessary for the strategy's explosive mana acceleration , it's also interesting to consider what else Urza's Cave can do in decks featuring Knight of the Reliquary, Elvish Reclaimer, and the Modern Horizons 3 reprint Sylvan Safekeeper
Enter Team Midnight Otani
Horizon Canopy, Grove of the Burnwillows, Aether Vial, Oblivion Stone, Glimpse the Unthinkable, Lotus Cobra, Magus of the Moon, Bloodghast, Thoughtseize, Flusterstorm, Ancestral Vision, Cryptic Command, Auriok Champion, Serra Ascendantthese were all very expensive cards