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But lets be honest, its kinda just your typical Simic value engine

While an exact valuation is tricky, recent precedent suggests the former lawyer is sitting on a monstrous payout

Cavern of Souls If Aether Vial is the heart of creature decks, that makes Cavern of Soulswell, the soul

But its ability lets you play an extra land and then draw a card to repeat the process if you still have lands in your hand

Two land drops (or one Fabled Passage) and this is already above rate as a 2/3 for one mana

While other cards over the years have featured effects similar to this (mythic rare Zur, Eternal Schemer from Dominaria United comes to mind), Opalescence was the first to do it en masse for enchantments, and, due to its novelty and being first on the scene, it clocks in with a price point approaching $30