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From $21.00
'({T}: Add {B} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $19.25
'Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) At the beginning of your upkeep, return target creature card from your graveyard to the battlefield....
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 $8.50
'This land enters tapped unless you control a Swamp or a Forest.
{T}: Add {B} or {G}.
From $13.75
'({T}: Add {B} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $43.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
From $12.00
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $17.50
At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X...
From $9.00
({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $11.50
'({T}: Add {U}, {B}, or {R}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)
From $1.00
'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...