Spectator Seating

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

Ghen, Arcanum Weaver

{R}{W}{B}, {T}, Sacrifice an enchantment: Return target enchantment card from your graveyard to the battlefield.

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

({T}: Add {B} 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 a Plains or a Swamp.
{T}: Add {W} or {B}.

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

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

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

{T}: Add {C}.
{1}{W}, {T}: Put target enchantment card from your graveyard on top of your library.

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

Lands you control have "{T}: Add one mana of any color."
{T}: Add one mana of any color.

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

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

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

{T}: Add {C}{C}. This land deals 2 damage to you.

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

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

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