Dimir Aqueduct

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

Slagwoods Bridge

This land enters tapped.
Indestructible
{T}: Add {R} or {G}.

({T}: Add {U} or {R}.)
This land enters tapped.

This land enters tapped.
Indestructible
{T}: Add {B} or {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 {B}{G}.

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

This land enters tapped.
Indestructible
{T}: Add {G} or {W}.

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

({T}: Add {G} or {W}.)
This land enters tapped.

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 {B}{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 {G}{U}.

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

This land enters tapped.
When this land enters, exile target player's graveyard.
{T}: Add {B}.