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.

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.

Cloudpost

Cloudpost enters the battlefield tapped. {T}: Add {1} to your mana pool for each Locus on the battlefield.

Karakas

{T}: Add {W} to your mana pool. {T}: Return target legendary creature to its owner's hand.

Batterskull

Living weapon (When this Equipment enters the battlefield, put a 0/0 black Germ creature token onto the battlefield, then attach this to it.) Equipped creature gets +4/+4 and has vigilance and lifelink. {3}: Return Batterskull to its owner's hand. Equip {5}

All Is Dust

Each player sacrifices all colored permanents he or she controls.

Eldrazi Temple

{T}: Add {1} to your mana pool. {T}: Add {2} to your mana pool. Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi.

Glimmerpost

When Glimmerpost enters the battlefield, you gain 1 life for each Locus on the battlefield. {T}: Add {1} to your mana pool.

Ratchet Bomb

{T}: Put a charge counter on Ratchet Bomb. {T}, Sacrifice Ratchet Bomb: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on Ratchet Bomb.

Ensnaring Bridge

Each creature with power greater than the number of cards in your hand cannot attack.

Vesuva

As Vesuva comes into play, you may choose a land in play. If you do, Vesuva comes into play tapped as a copy of the chosen land.

Grim Monolith

Grim Monolith does not untap during your untap phase. {4}: Untap Grim Monolith. {T}: Add three colorless mana to your mana pool. Play this ability as a mana source.

Ulamog, the Ceaseless Hunger

Endbringer

Matter Reshaper

Reality Smasher

Thought-Knot Seer

Warping Wail

Ancient Tomb

Eye of Ugin

Emrakul, the Promised End

Walking Ballista

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.

Sorcerous Spyglass

As Sorcerous Spyglass enters the battlefield, look at an opponent's hand, then choose any card name. Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.