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$30.50 – $44.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
$18.00 – $22.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
$13.00 – $15.75
'Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) Whenever you tap a Swamp for...
$0.25 – $0.50
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
$5.25 – $5.75
'This land enters tapped unless you control two or more other lands.
{T}: Add {U} or {B}.
$0.25 – $0.50
'Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
$21.25 – $26.75
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
$1.50 – $7.25
'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.
$10.25 – $13.75
({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
$16.50 – $31.25
'{T}: Add {C}.
{3}, {T}: Add {B} for each basic Swamp you control.
$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}.
$0.25 – $0.50
'{T}: Add {C}.
{T}: Add {B} or {G}. Activate only if you control a Swamp.