Atog

Sacrifice an artifact: This creature gets +2/+2 until end of turn.

Detonate

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

Dwarven Weaponsmith

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

Goblin Artisans

{T}: 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.

Orcish Mechanics

{T}, Sacrifice an artifact: This creature deals 2 damage to any target.

Shatterstorm

Destroy all artifacts. They can't be regenerated.

Argothian Pixies

This creature can't be blocked by artifact creatures.
Prevent all damage that would be dealt to this creature by artifact creatures.

Artifact Ward

Enchant creature
Enchanted creature can't be blocked by artifact creatures.
Prevent all damage that would be dealt to enchanted creature by artifact sources.
Enchanted creature can't be the target of abilities from artifact sources.

Argothian Treefolk

Prevent all damage that would be dealt to this creature by artifact sources.

Citanul Druid

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

Crumble

Destroy target artifact. It can't be regenerated. That artifact's controller gains life equal to its mana value.

Gaea's Avenger

Gaea's Avenger's power and toughness are each equal to 1 plus the number of artifacts your opponents control.

Powerleech

Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without {T} in its activation cost, you gain 1 life.

Titania's Song

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.

Amulet of Kroog

{2}, {T}: Prevent the next 1 damage that would be dealt to any target this turn.

Armageddon Clock

At the beginning of your upkeep, put a doom counter on this artifact.
At the beginning of your draw step, this artifact deals damage equal to the number of doom counters on it to each player.
{4}: Remove a doom counter from this artifact. Any player may activate this ability but only during any upkeep step.

Antiquities