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$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}.
$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.
$0.25 – $0.50
'{T}: Add {C}.
{T}: Add {B} or {G}. Activate only if you control a Swamp.
$0.25 – $0.50
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
$54.75 – $70.50
'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....
$13.75 – $20.50
'({T}: Add {B} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
$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}.
$0.25 – $0.50
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
$0.25
'At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control.
$0.25
'{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) Swampcycling {2} ({2},...
$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.
$26.25 – $35.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.