Unearth

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Chromatic Star

{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.

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

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

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

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