Submerged Boneyard

In Commander, Submerged Boneyard is pure budget infrastructure — it does exactly one thing, and it does it reliably: it produces blue and black mana without costing you anything beyond the enters-tapped clause. Competitive Commander lists skip it in favor of fetchlands and original duals, but any budget dimir deck should run it without hesitation. In Pauper, it slots into any two-color shell that can tolerate a tap-land, and the zero financial barrier makes it a staple at that level. Constructed formats like Modern and Pioneer have access to better dual lands at similar price points, so Submerged Boneyard rarely sees play there outside of budget brews.