Myr Enforcer

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

Perilous Research

Draw two cards, then sacrifice a permanent.

Whenever an artifact is put into a graveyard from the battlefield, you may gain 5 life.

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

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Menace

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

When Ichor Wellspring enters or is put into a graveyard from the battlefield, 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.

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

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

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