Myr Retriever

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

Chromatic Sphere

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

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

Artifact spells you cast cost {1} less to cast.

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

Lightning Bolt deals 3 damage to any target.

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

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.)