Rootbound Crag

The whole design lives in the entry clause: it arrives untapped only if you already control a Mountain or a Forest, which checks for those land subtypes rather than for basic lands specifically. A shockland, an original dual, or a triome bearing the right type satisfies the condition exactly as cleanly as a basic does; what this land reads is type, not rarity. The gate descends from the original dual lands, which carry their own subtypes and read them to function, but this template inverts the relationship. It bears neither the Mountain nor the Forest type itself, so it cannot look inward; it has to survey the rest of your board to decide how it enters. That is why it never helps your first land drop. With no qualifying land yet down, it enters tapped on turn one every time, and the untapped reward only arrives once a type-bearing land precedes it. The cost is real and it lands at the worst moments, sometimes sitting tapped exactly when a two-color aggressive deck wants the tempo most. But the trade is a one-time deckbuilding commitment rather than a recurring tax: you pay at construction by running enough lands with the matching subtypes, and from there the land asks nothing more. No life, like a painland; no unconditional slow, like a tapland. That clean exchange is why this checkland template aged so gracefully: it asks for discipline in the manabase instead of blood at the point of use.