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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 $23.50
'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 $16.25
'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 $21.00
'({T}: Add {B} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
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...
From $7.00
'[+1]: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle. [−3]: Target creature gets +X/+X or -X/-X until end of turn, where X...
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 $7.25
({T}: Add {U} or {B}.)
This land enters tapped.
When this land enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
From $11.00
'({T}: Add {B} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
