Sulfurous Mire

({T}: Add {B} or {R}.)
This land enters tapped.

Snow-Covered Mountain

({T}: Add {R} or {W}.)
This land enters tapped.

({T}: Add {G} or {W}.)
This land enters tapped.

({T}: Add {W} or {B}.)
This land enters tapped.

({T}: Add {W} or {U}.)
This land enters tapped.

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

({T}: Add {B} or {G}.)
This land enters tapped.

({T}: Add {U} or {B}.)
This land enters tapped.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.

({T}: Add {R} or {G}.)
This land enters tapped.

({T}: Add {U} or {R}.)
This land enters tapped.

({T}: Add {G} or {U}.)
This land enters tapped.