Dimir Aqueduct

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {U}{B}.

Golgari Rot Farm

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {B}{G}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {U}{R}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {G}{W}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {W}{B}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {G}{U}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {B}{R}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {R}{G}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {R}{W}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {W}{U}.