Myr Enforcer

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Draw cards equal to the highest mana value among permanents you control.

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

Galvanic Blast deals 2 damage to any target.
Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Flying

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.

{T}, Tap an untapped creature you control: Add one mana of any color.

Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life.

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color.
When Chromatic Star is put into a graveyard from the battlefield, draw a card.

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

When Prophetic Prism enters, draw a card.
{1}, {T}: Add one mana of any color.

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

Destroy target artifact.
Flashback {G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Choose one —
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.

Metalcraft — Carapace Forger gets +2/+2 as long as you control three or more artifacts.