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This land enters tapped unless you have two or more opponents.
{T}: Add {U} or {R}.

Steam Vents

({T}: Add {U} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

This land enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.

This land enters tapped unless you control two or more other lands.
{T}: Add {U} or {R}.

{T}: Add one mana of any color in your commander's color identity.

{T}: Add {C}.
{T}: Add {U} or {R}. This land deals 1 damage to you.

{T}: Add one mana of any color that a land an opponent controls could produce.