Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

Mutavault

{T}: Add {1} to your mana pool. {1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

Pithing Needle

As Pithing Needle comes into play, name a card. Activated abilities of sources with the chosen name can't be played unless they're mana abilities.

Hero's Downfall

Destroy target creature or planeswalker.

Nykthos, Shrine to Nyx

{T}: Add {1} to your mana pool. {2}, {T}: Choose a color. Add to your mana pool an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

Thoughtseize

Target player reveals his or her hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Drana, Liberator of Malakir

Grasp of Darkness

Kalitas, Traitor of Ghet

Stromkirk Condemned

Fatal Push

Gifted Aetherborn

Champion of Dusk

When Champion of Dusk enters the battlefield, you draw X cards and you lose X life, where X is the number of Vampires you control.

Ashiok, Dream Render

Spells and abilities your opponents control can't cause their controller to search their library. −1: Target player puts the top four cards of their library into their graveyard. Then exile each opponent's graveyard.

Blightbeetle

Protection from green (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything green.) Creatures your opponents control can't have +1/+1 counters put on them.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Knight of the Ebon Legion

{2}{B}: Knight of the Ebon Legion gets +3/+3 and gains deathtouch until end of turn. At the beginning of your end step, if a player lost 4 or more life this turn, put a +1/+1 counter on Knight of the Ebon Legion. (Damage causes loss of life.)

Leyline of the Void

If Leyline of the Void is in your opening hand, you may begin the game with it on the battlefield. If a card would be put into an opponent's graveyard from anywhere, exile it instead.

Sorin, Imperious Bloodlord

+1: Target creature you control gains deathtouch and lifelink until end of turn. If it's a Vampire, put a +1/+1 counter on it. +1: You may sacrifice a Vampire. When you do, Sorin, Imperious Bloodlord deals 3 damage to any target and you gain 3 life. −3: You may put a Vampire creature card from your hand onto the battlefield.

Witch's Vengeance

Creatures of the creature type of your choice get -3/-3 until end of turn.

Castle Locthwain

Castle Locthwain enters the battlefield tapped unless you control a Swamp. {T}: Add {B}. {1}{B}{B}, {T}: Draw a card, then you lose life equal to the number of cards in your hand.

Gray Merchant of Asphodel

When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)