Mystic Gate

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

Plains

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

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

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

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

This land enters tapped.
{T}: Add {U}, {R}, or {W}.

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

({T}: Add {U}, {R}, or {W}.)
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 have two or more opponents.
{T}: Add {W} or {U}.

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

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

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

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

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

{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 {U} or {R}.

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

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

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

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

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