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'At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control.
'All Swamps are 1/1 black creatures that are still lands.
'Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
'[+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...
'{T}, Sacrifice a creature and a Swamp: Destroy target nonartifact creature. It can't be regenerated.
{T}, Sacrifice a creature and a snow Swamp: Destroy target creature. It can't be regenerated.
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
'{T}: Add {C}.
{T}: Add {B} or {R}. Activate only if you control a Swamp.
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
'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.
'If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.