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From $1.25
'This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
From $19.75
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
From $0.75
'This land enters tapped unless you control a Plains or a Swamp.
{T}: Add {W} or {B}.
From $17.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
From $0.75
'This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
$0.25
({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.
$0.25
'Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Cycling—Pay 2 life. (Pay 2 life, Discard this card: Draw a card.)
From $7.25
({T}: Add {W} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $1.50
'Jarad gets +1/+1 for each creature card in your graveyard. {1}{B}{G}, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power. Sacrifice a Swamp and a Forest:...
From $2.75
'({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.