Llanowar Wastes

{T}: Add {C}.
{T}: Add {B} or {G}. This land deals 1 damage to you.

Quicksand

{T}: Add {C}.
{T}, Sacrifice this land: Target attacking creature without flying gets -1/-2 until end of turn.

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

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

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

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.