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.

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.)

Demonic Consultation

Name a card. Remove the top six cards of your library from the game and reveal the next card to all players. If it is the card named, put it into your hand. If not, remove that card from the game and continue revealing the top card of your library and removing it from the game until the named card appears.

Pyroblast

Counter target spell if it is blue or destroy target permanent if it is blue.

Simian Spirit Guide

Remove Simian Spirit Guide in your hand from the game: Add {R} to your mana pool.

Urborg, Tomb of Yawgmoth

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

Mana Crypt

At the beginning of your upkeep, flip a coin. If you lose the flip, Mana Crypt deals 3 damage to you. {T}: Add {2} to your mana pool.

Mox Opal

Metalcraft — {T}: Add one mana of any color to your mana pool. Activate this ability only if you control three or more artifacts.

Painter's Servant

As Painter's Servant comes into play, choose a color. All cards that aren't in play, spells, and permanents are the chosen color in addition to their other colors.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you. {T}: Add one mana of a color of your choice to your mana pool.

Grindstone

{3}, {T}: Put the top 2 cards of target player's library into that player's graveyard. If both cards share at least one color, repeat this process.

Mana Vault

Tap to add 3 colorless mana to your mana pool. Mana Vault doesn't untap normally during untap phase; to untap it, you must pay 4 mana. If Mana Vault remains tapped during upkeep it does 1 damage to you. Tapping this artifact can be played as an interrupt.

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.

Red Elemental Blast

Counters a blue spell being cast or destroys a blue card in play.

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.

Balance

Whichever player has more lands in play must discard enough lands of his or her choice to equalize the number of lands both players have in play. Cards in hand and creatures in play must be equalized the same way. Creatures lost in this manner may not be regenerated.

Mox Pearl

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

Ancestral Recall

Draw 3 cards or force opponent to draw 3 cards.

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.

Demonic Tutor

You may search your library for one card and take it into your hand. Reshuffle your library afterwards.

Defense Grid

During each player's turn, spells played by another player cost an additional {3}.

Memory Jar

{T}, Sacrifice Memory Jar: Each player sets aside his or her hand, face down, and draws seven cards. At the end of turn, each player discards his or her hand and returns to his or her hand each card he or she set aside this way.

Tinker

At the time you play Tinker, sacrifice an artifact. Search your library for an artifact card and put that artifact into play. Shuffle your library afterward.

Goblin Welder

{T}: Choose a player. Exchange target artifact that player controls with target artifact in that player's graveyard.

Tolarian Academy

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

Vampiric Tutor

Pay 2 life: Search your library for any one card. Shuffle your library, then put that card on top of your library.

Sol Ring

Ancient Tomb

Mana Confluence

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.