Urza's Tower

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

Vault of Whispers

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

({T}: Add {W} or {B}.)
Snowfield Sinkhole enters tapped.

({T}: Add {U} or {R}.)
Volatile Fjord enters tapped.

({T}: Add {G} or {W}.)
Arctic Treeline enters tapped.

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

({T}: Add {G} or {U}.)
Rimewood Falls enters tapped.

({T}: Add {R} or {G}.)
Highland Forest enters tapped.

({T}: Add {B} or {G}.)
Woodland Chasm enters tapped.

({T}: Add {R} or {W}.)
Alpine Meadow enters tapped.

({T}: Add {W} or {U}.)
Glacial Floodplain enters tapped.

({T}: Add {B} or {R}.)
Sulfurous Mire enters tapped.

({T}: Add {U} or {B}.)
Ice Tunnel enters tapped.