Urborg, Tomb of Yawgmoth

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

Thoughtseize

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

Watery Grave

Choked Estuary

Prized Amalgam

Elder Deep-Fiend

Haunted Dead

Scrapheap Scrounger

Smuggler's Copter

Fatal Push

Drowned Catacomb

Emry, Lurker of the Loch

This spell costs {1} less to cast for each artifact you control. When Emry, Lurker of the Loch enters the battlefield, put the top four cards of your library into your graveyard. {T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

Cauldron Familiar

When Cauldron Familiar enters the battlefield, each opponent loses 1 life and you gain 1 life. Sacrifice a Food: Return Cauldron Familiar from your graveyard to the battlefield.

Witch's Oven

{T}, Sacrifice a creature: Create a Food token. If the sacrificed creature's toughness was 4 or greater, create two Food tokens instead. (They're artifacts with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")

Island

({T}: Add {U}.)

Swamp

({T}: Add {B}.)