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$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}.
$12.00 – $13.75
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
$16.50 – $31.25
'{T}: Add {C}.
{3}, {T}: Add {B} for each basic Swamp you control.
$18.00 – $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.
$0.25
'Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
$5.25 – $6.50
'This land enters tapped unless you control two or fewer other lands.
{T}: Add {B} or {G}.
$29.25 – $36.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
$0.25 – $0.50
'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}.
$0.25 – $0.75
'Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
$0.25 – $0.50
'{T}: Add {C}.
{1}, {T}, Sacrifice this land: Search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
$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 – $0.75
'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}.