Undergrowth Stadium

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

Maze of Ith

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

({T}: Add {U}, {B}, or {R}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

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

{T}: Add {C}.
{T}, Sacrifice this land: Put your commander into your hand from the command zone.

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

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

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

{T}: Add {C}.
{G/W}, {T}: Add {G}{G}, {G}{W}, or {W}{W}.

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

{T}: Add one mana of any type that a land you control could produce.

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

This land enters tapped unless you control a Swamp or a Forest.
{T}: Add {B} or {G}.

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

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

{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.

This land enters tapped unless you control a Plains or a Swamp.
{T}: Add {W} or {B}.

({T}: Add {B}, {G}, or {U}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

{T}: Add {C}.
{U/R}, {T}: Add {U}{U}, {U}{R}, or {R}{R}.

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

{T}: Add {C}.
{T}: Add {B} or {G}. This land deals 1 damage to you.

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

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