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$1.25 – $1.75
'({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.
$1.00 – $1.75
'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...
$0.75 – $1.25
'This land enters tapped.
When this land enters, sacrifice it unless you return an untapped Swamp you control to its owner's hand.
{T}: Add {C}{B}.
$1.25 – $3.25
'This creature gets +1/+1 as long as you control a Swamp.
{B}: Regenerate this creature.
$27.50 – $54.75
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
$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}.
$26.50 – $32.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
$3.00 – $4.75
'({T}: Add {B} or {R}.)
This land enters tapped unless you control two or more basic lands.
$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}.
$0.25 – $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}.
$1.25 – $5.25
'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."