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.

Thorn of Amethyst

Noncreature spells cost {1} more to play.

Scab-Clan Berserker

Haste Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)Whenever an opponent casts a noncreature spell, if Scab-Clan Berserker is renowned, Scab-Clan Berserker deals 2 damage to that player.

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.

Simian Spirit Guide

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

Dark Confidant

At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its converted mana cost.

Lotus Petal

Sacrifice Lotus Petal: Add one mana of any color to your mana pool. Play this ability as a mana source.

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.

Mana Confluence

Strip Mine

Wasteland

Thalia's Lieutenant

Thalia, Heretic Cathar

Kitesail Freebooter

1B

Unclaimed Territory

Lavinia, Azorius Renegade

Each opponent can't cast noncreature spells with converted mana cost greater than the number of lands that player controls. Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.