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From $8.00
'[+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 $28.50
'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 $28.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
From $15.75
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
$56.05
When venturing deep into the forest, be mindful of the myriad of creatures that you may encounter on your path. Prepare yourself, as a simple stroll through the woods can...
$0.25
When this land enters, sacrifice it. When you do, search your library for a basic Swamp, Mountain, or Forest card, put it onto the battlefield tapped, then shuffle and you...
From $31.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
From $78.00
'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}....
From $1.50
'{1}{B}, {T}, Sacrifice a creature: Search your library for a Zombie card and a Swamp card, reveal them, put them into your hand, then shuffle.
From $0.25
'Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.