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$15.75 – $20.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
$4.00 – $5.75
'If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost.
All creatures get -2/-2 until end of turn.
$1.25 – $4.75
'{G}{G}: This creature gains forestwalk until end of turn and deals 2 damage to you. (It can't be blocked as long as defending player controls a Forest.) {B}{B}: This creature...
$2.00 – $3.00
'This land enters tapped unless you control two or fewer other lands.
{T}: Add {B} or {G}.
$0.25
'Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
$6.50 – $8.00
'This land enters tapped unless you control two or more other lands.
{T}: Add {U} or {B}.
$0.50 – $2.00
'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.
$10.00 – $18.75
'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...
$9.00 – $11.25
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
$0.25 – $0.50
'As this land enters, you may reveal a Swamp or Mountain card from your hand. If you don't, this land enters tapped.
{T}: Add {B} or {R}.
$0.75 – $1.25
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 – $0.75
'As this land enters, you may reveal a Swamp or Forest card from your hand. If you don't, this land enters tapped.
{T}: Add {B} or {G}.