Breeding Pool

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

Sol Ring

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

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

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

This artifact enters tapped.
{T}: Add {G}.

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

{T}: Add {C}.
{T}: Add {G} or {U}. This artifact deals 1 damage to you.

This artifact enters tapped.
{T}: Add {U}.