City of Traitors

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

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.)

Magus of the Moon

Nonbasic lands are Mountains.

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.

Sulfur Elemental

Flash (You may play this spell any time you could play an instant.) Split second (As long as this spell is on the stack, players can't play spells or activated abilities that aren't mana abilities.) White creatures get +1/-1.

Chrome Mox

Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand. {T}: Add one mana of any of the exiled card's colors to your mana pool.

Ensnaring Bridge

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

Lotus Petal

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

Blood Moon

All non-basic lands are now basic mountains.

Gemstone Caverns

If Gemstone Caverns is in your opening hand and you're not playing first, you may begin the game with Gemstone Caverns in play with a luck counter on it. If you do, remove a card in your hand from the game. {T}: Add {1} to your mana pool. If Gemstone Caverns has a luck counter on it, instead add one mana of any color to your mana pool.

Fiery Confluence

Ancient Tomb

Sin Prodder

Chandra, Torch of Defiance

Hazoret the Fervent

Leyline of Sanctity

If Leyline of Sanctity is in your opening hand, you may begin the game with it on the battlefield. You have hexproof. (You can't be the target of spells or abilities your opponents control.)

Mountain

({T}: Add {R}.)