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.

Mycosynth Lattice

All permanents are artifacts in addition to their other types. All cards that aren't in play, spells, and permanents are colorless. Players may spend mana as though it were mana of any color.

Serum Powder

{T}: Add {1} to your mana pool. Any time you could mulligan and Serum Powder is in your hand, you may remove your hand from the game, then draw that many cards. (You can do this in addition to taking mulligans.)

City of Traitors

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

Urza's Bauble

{T}: Sacrifice Urza's Bauble to choose a card at random from target player's hand; look at that card. Ignore this ability if that player has no cards left in hand. Draw a card at the beginning of the next turn's upkeep.

Lion's Eye Diamond

Sacrifice Lion's Eye Diamond, Discard your hand: Add three mana of any one color to your mana pool. Play this ability as a mana source.

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.

Engineered Explosives

Sunburst (This enters the battlefield with a charge counter on it for each color of mana spent to cast it.) {2}, Sacrifice Engineered Explosives: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on Engineered Explosives.

Ancient Den

(Ancient Den isn't a spell.) {T}: Add {W} to your mana pool.

Karakas

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

Liquimetal Coating

{T}: Target permanent becomes an artifact in addition to its other types until end of turn.

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.

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.

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Remove target player's graveyard from the game.

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.

Voltaic Key

{1}, {T}: Untap target artifact.

Basalt Monolith

Ancient Tomb

Walking Ballista

Karn, the Great Creator

Activated abilities of artifacts your opponents control can't be activated. +1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost. −2: You may choose an artifact card you own from outside the game or in exile, reveal that card, and put it into your hand.

Manifold Key

{1}, {T}: Untap another target artifact. {3}, {T}: Target creature can't be blocked this turn.

Mystic Forge

You may look at the top card of your library any time. You may cast artifact spells and colorless spells from the top of your library. {T}, Pay 1 life: Exile the top card of your library.

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.

Soul-Guide Lantern

When Soul-Guide Lantern enters the battlefield, exile target card from a graveyard. {T}, Sacrifice Soul-Guide Lantern: Exile each opponent's graveyard. {1}, {T}, Sacrifice Soul-Guide Lantern: Draw a card.

Plains

({T}: Add {W}.)