Gearseeker Serpent

This spell costs {1} less to cast for each artifact you control.
{5}{U}: Gearseeker Serpent can't be blocked this turn.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Sacrifice Welding Jar: Regenerate target artifact.

Flying
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

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

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

{T}: Target player exiles a card from their graveyard.
{1}, Exile Relic of Progenitus: Exile all graveyards. Draw a card.

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.

{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.

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Lifelink
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Rustvale Bridge enters tapped.
Indestructible
{T}: Add {R} or {W}.

Silverbluff Bridge enters tapped.
Indestructible
{T}: Add {U} or {R}.

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

Razortide Bridge enters tapped.
Indestructible
{T}: Add {W} or {U}.

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