Sacrifice a Swamp: Marsh Lurker gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

When Marshdrinker Giant enters, destroy target Island or Swamp an opponent controls.

Target player discards a card for each Swamp you control.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

: Regenerate Mire Boa. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

, Sacrifice a Swamp: Put a +1/+1 counter on Mire Shade. Activate only as a sorcery.

When Mold Demon enters, sacrifice it unless you sacrifice two Swamps.

All creatures get -1/-1 until end of turn for each Swamp you control.

At the beginning of your upkeep, sacrifice Nature's Wrath unless you pay .

Whenever a player puts an Island or blue permanent onto the battlefield, that player sacrifices an Island or blue permanent of their choice.

Whenever a player puts a Swamp or black permanent onto the battlefield, that player sacrifices a Swamp or black permanent of their choice.

As Necroblossom Snarl enters, you may reveal a Swamp or Forest card from your hand. If you don't, Necroblossom Snarl enters tapped.

: Add or .

Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)

Draw a card.

Search target player's library for up to X cards, where X is the number of Swamps you control, and exile them. Then that player shuffles.

Whenever you tap a Swamp for mana, add an additional .

: Nirkana Revenant gets +1/+1 until end of turn.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Whenever Odylic Wraith deals damage to a player, that player discards a card.

You may discard a Swamp card rather than pay this spell's mana cost.

Choose a creature type. All creatures of that type get -1/-1 until end of turn.

Flying

Dynastic Advisor — When Plasmancer enters, search your library for a basic Swamp card, reveal it, put it into your hand, then shuffle.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Multikicker (You may pay an additional any number of times as you cast this spell.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Quag Vampires enters with a +1/+1 counter on it for each time it was kicked.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

If tapped for mana, Plains produce , Swamps produce , Mountains produce , and Forests produce instead of any other type.

, : Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)

: Regenerate Restless Bones.

When Riveteers Overlook 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 gain 1 life.

As Roots of Life enters, choose Island or Swamp.

Whenever a land of the chosen type an opponent controls becomes tapped, you gain 1 life.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, Royal Decree deals 1 damage to that permanent's controller.

Sedge Troll gets +1/+1 as long as you control a Swamp.

: Regenerate Sedge Troll.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Search your library for a Plains card, an Island card, a Swamp card, and a Mountain card. Reveal those cards, put them into your hand, then shuffle.

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.

At the beginning of each opponent's upkeep, that player sacrifices a creature of their choice.

Sima Yi, Wei Field Marshal's power is equal to the number of Swamps you control.

Whenever Slavering Nulls deals combat damage to a player, if you control a Swamp, you may have that player discard a card.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

When Slithery Stalker enters, exile target green or white creature an opponent controls.

When Slithery Stalker leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Whenever a player casts a black spell, you gain 1 life.

Ward—Discard a card. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player discards a card.)

Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Enchant Swamp

When enchanted land becomes tapped, destroy it.

When Spreading Algae is put into a graveyard from the battlefield, return Spreading Algae to its owner's hand.

Squelching Leeches's power and toughness are each equal to the number of Swamps you control.

Swampwalk, forestwalk (This creature can't be blocked as long as defending player controls a Swamp or a Forest.)

, Pay 2 life, Sacrifice a Swamp: Return target creature card from your graveyard to the battlefield.

Flying

Whenever Swamp Mosquito attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)

: Add .

: Add or . Activate only if you control a Swamp.

Enchant land

When Tainted Well enters, draw a card.

Enchanted land is a Swamp.

Tek gets +0/+2 as long as you control a Plains, has flying as long as you control an Island, gets +2/+0 as long as you control a Swamp, has first strike as long as you control a Mountain, and has trample as long as you control a Forest.

At the beginning of your upkeep, sacrifice Thelon's Chant unless you pay .

Whenever a player puts a Swamp onto the battlefield, Thelon's Chant deals 3 damage to that player unless the player puts a -1/-1 counter on a creature they control.

: Regenerate Twisted Abomination. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

: Add .

: Target creature loses first strike or swampwalk until end of turn.

First strike

Creatures with swampwalk can be blocked as though they didn't have swampwalk.

, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.

: Viscid Lemures gets -1/-0 and gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)

Shuffle your whammy deck, then reveal cards from the top of your whammy deck until you reveal an Island or choose to stop. Then, if no Islands were revealed this way, CARDNAME deals X damage to any target, where X is the number of cards revealed. (A whammy deck consists of a Plains, Island, Swamp, Mountain, and Forest.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

: Whispering Shade gets +1/+1 until end of turn.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

: Add . Target opponent gains control of Witch Engine. (Activate only as an instant.)

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Withering Wisps.

: Withering Wisps deals 1 damage to each creature and each player. Activate no more times each turn than the number of snow Swamps you control.