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$0.25 – $0.75
'Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
$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.
$3.25 – $4.50
'Target creature gets -1/-1 until end of turn for each Swamp you control.
$0.25
'{T}: Add {C}.
{1}, {T}, Sacrifice this land: Search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle.
$0.25
'This land enters tapped.
{T}, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
$72.75 – $124.50
'If this land would enter, sacrifice a Swamp instead. If you do, put this land onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add {B}....
$0.25 – $0.50
'{T}: Add {C}.
{T}: Add {B} or {G}. Activate only if you control a Swamp.
$0.50 – $1.25
'All Sliver creatures have "This creature gets +1/+1 as long as you control a Swamp." All Slivers have "{B}: Regenerate this permanent." (The next time it would be destroyed this...
$2.00 – $2.75
'Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have "{B}: Regenerate this permanent."
$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}.