Helm of Obedience

{X}, {T}: Put the top card of target opponent's library into his or her graveyard. Continue doing this until you have put X cards or a creature card into that graveyard, whichever occurs first. If the last card put into the graveyard is a creature card, bury Helm of Obedience and put that creature into play under your control as though it were just cast. X cannot be equal to 0.

Mishra's Workshop

Tap to add 3 colorless mana to your mana pool. This mana may only be used to cast artifacts.

Dark Depths

Dark Depths comes into play with ten ice counters on it. {3}: Remove an ice counter from Dark Depths. When Dark Depths has no ice counters on it, sacrifice it. If you do, put an indestructible legendary 20/20 black Avatar creature token with flying named Marit Lage into play.

Sphere of Resistance

All spells cost an additional {1} to play.

Trinisphere

As long as Trinisphere is untapped, each spell that would cost less than three mana to cast costs three mana to cast. (Additional mana in the cost may be paid with any color of mana or colorless mana. For example, a spell that would cost {1}{B} to cast costs {2}{B} to cast instead.)

Thespian's Stage

{T}: Add {1} to your mana pool. {2}, {T}: Thespian's Stage becomes a copy of target land and gains this ability.

The Tabernacle at Pendrell Vale

All creatures now require an upkeep cost of {1} in addition to any other upkeep costs they may have. If the upkeep cost for a creature is not paid, the creature is destroyed.

Thorn of Amethyst

Noncreature spells cost {1} more to play.

Chalice of the Void

Chalice of the Void enters the battlefield with X charge counters on it. Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void, counter that spell.

Urborg, Tomb of Yawgmoth

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

Crucible of Worlds

You may play land cards from your graveyard.

Mox Emerald

Add 1 green mana to your mana pool. Tapping this artifact can be played as an interrupt.

Mox Sapphire

Add 1 blue mana to your mana pool. Tapping this artifact can be played as an interrupt.

Mox Jet

Add 1 black mana to your mana pool. Tapping this artifact can be played as an interrupt.

Mox Ruby

Add 1 red mana to your mana pool. Tapping this artifact can be played as an interrupt.

Mox Pearl

Add 1 white mana to your mana pool. Tapping this artifact can be played as an interrupt.

Black Lotus

Adds 3 mana of any single color of your choice to your mana pool, then is discarded. Tapping this artifact can be played as an interrupt.

Tolarian Academy

{T}: Add {U} to your mana pool for each artifact you control.

Null Rod

Players cannot play any artifact abilities requiring an activation cost.

Lodestone Golem

Nonartifact spells cost {1} more to cast.

Vampire Hexmage

First strike Sacrifice Vampire Hexmage: Remove all counters from target permanent.

Expedition Map

{2}, {T}, Sacrifice Expedition Map: Search your library for a land card, reveal it, and put it into your hand. Then shuffle your library.

Sol Ring

Ancient Tomb

Strip Mine

Wasteland

Inventors' Fair

Mirage Mirror

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.