: Add . If you control an Urza's Mine and an Urza's Power-Plant, add instead.

: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.

: Add .
: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
: Target Assembly-Worker creature gets +1/+1 until end of turn.

: Add . If you control an Urza's Mine and an Urza's Tower, add instead.

: Add .
, Sacrifice this land: Destroy target land.

: Flip a coin. If you win the flip, draw a card. If you lose the flip, counter target artifact spell you control that isn't the target of an ability from another creature named Goblin Artisans.

, Sacrifice this artifact: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.

At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4.

, Exile this artifact: Shuffle your graveyard into your library.

As this artifact enters, choose an opponent.
At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand.

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

, Sacrifice an artifact: Put a +1/+1 counter on target creature. Activate only during your upkeep.

, : Target player mills two cards.

Sacrifice a creature: Destroy target artifact. Activate only during your upkeep and only once each turn.

: The next time an artifact source of your choice would deal damage to you this turn, prevent that damage.

Sacrifice an artifact. If you do, search your library for an artifact card. If that card's mana value is less than or equal to the sacrificed artifact's mana value, put it onto the battlefield. If it's greater, you may pay , where X is the difference. If you do, put it onto the battlefield. If you don't, put it into its owner's graveyard. Then shuffle.

You may choose not to untap this artifact during your untap step.
, : Target creature gets +1/+1 for as long as this artifact remains tapped.

Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without in its activation cost, you gain 1 life.

You may choose not to untap this artifact during your untap step.
, : Target creature you control gets +2/-2 for as long as this artifact remains tapped.

Enchant artifact
Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature.

Players can't untap more than one artifact during their untap steps.

: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.

, : Draw a card, then discard a card.

Defender (This creature can't attack.)
First strike

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay ."

Sacrifice a creature: Add .

When this creature dies, you gain 2 life.

Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its mana value. If this enchantment leaves the battlefield, this effect continues until end of turn.

As this artifact enters, choose an opponent.
The chosen player's maximum hand size is four.

Attacking creatures get -1/-0.

, : Target creature with power 2 or less can't be blocked this turn.

Whenever an artifact becomes tapped or a player activates an artifact's ability without in its activation cost, this enchantment deals 1 damage to that artifact's controller.

When this creature dies, add .

As this creature enters, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)

Attacking creatures get +1/+0.