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From $1.50
'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.
From $1.50
'{1}{B}, {T}, Sacrifice a creature: Search your library for a Zombie card and a Swamp card, reveal them, put them into your hand, then shuffle.
From $11.00
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
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.
From $0.25
'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}.
From $3.50
'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.
From $59.00
'{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 $9.50
'{T}: Add {U}.
{T}: Add {B}. Activate only if you control an Island or a Swamp.
From $21.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.