Galvanic Blast

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

Kuldotha Rebirth

As an additional cost to cast this spell, sacrifice an artifact.
Create three 1/1 red Goblin creature tokens.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

Lightning Bolt deals 3 damage to any target.

Whenever an artifact you control enters, Reckless Fireweaver deals 1 damage to each opponent.

Whenever a creature you control enters, Impact Tremors deals 1 damage to each opponent.

{1}, {T}, Sacrifice Chromatic Sphere: Add one mana of any color. Draw a card.

{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 spell if it's blue.
• Destroy target permanent if it's blue.

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