Cavern of Souls

As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {1} to your mana pool. {T}: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Containment Priest

Flash If a nontoken creature would enter the battlefield and it wasn't cast, exile it instead.

Thalia, Guardian of Thraben

First strike Noncreature spells cost {1} more to cast.

City of Traitors

If you play any land, sacrifice City of Traitors. {T}: Add two colorless mana to your mana pool.

Thorn of Amethyst

Noncreature spells cost {1} more to play.

Phyrexian Revoker

As Phyrexian Revoker enters the battlefield, name a nonland card. Activated abilities of sources with the chosen name can't be activated.

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.

Umezawa's Jitte

Whenever equipped creature deals combat damage, put two charge counters on Umezawa's Jitte. Remove a charge counter from Umezawa's Jitte: Choose one — Equipped creature gets +2/+2 until end of turn; or target creature gets -1/-1 until end of turn; or you gain 2 life. Equip {2}

Karakas

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

Rest in Peace

When Rest in Peace enters the battlefield, exile all cards from all graveyards. If a card or token would be put into a graveyard from anywhere, exile it instead.

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.

Mox Diamond

When Mox Diamond comes into play, choose and discard a land card or sacrifice Mox Diamond. {T}: Add one mana of any color to your mana pool. Play this ability as a mana source.

Armageddon

All lands in play are destroyed.

Swords to Plowshares

Target creature is removed from game entirely; return to owner's deck only when game is over. Creature's controller gains life points equal to creature's power.

Gideon, Ally of Zendikar

Eldrazi Displacer

Reality Smasher

Thought-Knot Seer

Ancient Tomb

Wasteland

Thalia, Heretic Cathar

Smuggler's Copter

Disenchant

Destroy target artifact or enchantment.

Plains

({T}: Add {W}.)