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From $9.50
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $113.75
'Each land is a Swamp in addition to its other land types.
From $7.75
({T}: Add {B} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
$0.25
({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.
From $16.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
$0.25
'({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.
From $28.50
'Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) At the beginning of your upkeep, return target creature card from your graveyard to the battlefield....
$0.25
'As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped.
{T}: Add {U} or {B}.
From $1.50
'This creature gets +1/+1 as long as you control a Swamp.
{B}: Regenerate this creature.
From $0.25
'Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.