Rockfall Vale

It is much weaker on turns one and two than Blooming Marsh (87) and other established duals; only a slow red-green shell might test it.

Could be wrong if A successful slow red-green deck with unusually demanding color needs could value its untapped-from-turn-three condition.

Modern's fetch-shock mana, including Steam Vents (90), makes a dual that cannot reliably cast early spells a poor competitive option.

Could be wrong if An unknown red-green strategy could accept the tempo loss for a very basic-heavy mana base.

Legacy mana bases demand immediate colored mana; it is dramatically less efficient than fetch lands and Underground Sea (92)-style dual access.

Could be wrong if A niche basic-land-heavy red-green deck could want another nonbasic dual, though no such home is supplied.

In optimized red-green decks, its early tapped turns make it highly replaceable by the many available untapped duals, fetches, and fixing lands.

Could be wrong if Slower two-color lists may run enough lands that this becomes an acceptable lower-tier fixing inclusion.

It normally makes red-green decks by fixing both colors, but entering tapped through turn two creates real sequencing and tempo costs.

Could be wrong if Unknown set speed, fixing density, and color-pair incentives could make the tempo loss either negligible or prohibitive.