Scroll Rack

{1}, {T}: Exile any number of cards from your hand face down. Put that many cards from the top of your library into your hand. Then look at the exiled cards and put them on top of your library in any order.

Fire Diamond

This artifact enters tapped.
{T}: Add {R}.

Temporal Aperture

{5}, {T}: Shuffle your library, then reveal the top card. Until end of turn, for as long as that card remains on top of your library, play with the top card of your library revealed and you may play that card without paying its mana cost. (If it has X in its mana cost, X is 0.)

Thran Dynamo

Marble Diamond

This artifact enters tapped.
{T}: Add {W}.

Plains

Worn Powerstone

This artifact enters tapped.
{T}: Add {C}{C}.

Winter Orb

As long as this artifact is untapped, players can't untap more than one land during their untap steps.

Karn, Silver Golem

Whenever Karn blocks or becomes blocked, it gets -4/+4 until end of turn.
{1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.

Mountain

Wildfire

Each player sacrifices four lands of their choice. Wildfire deals 4 damage to each creature.

Ancient Tomb

{T}: Add {C}{C}. This land deals 2 damage to you.

Squee, Goblin Nabob

At the beginning of your upkeep, you may return this card from your graveyard to your hand.

Masticore

At the beginning of your upkeep, sacrifice this creature unless you discard a card.
{2}: This creature deals 1 damage to target creature.
{2}: Regenerate this creature.

Armageddon

Voltaic Key

Mox Diamond

If this artifact would enter, you may discard a land card instead. If you do, put this artifact onto the battlefield. If you don't, put it into its owner's graveyard.
{T}: Add one mana of any color.