Assert Authority

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Annul

Counter target artifact or enchantment spell.

Argivian Restoration

Return target artifact card from your graveyard to the battlefield.

Voyage Home

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
You draw three cards and gain 3 life.

Aeolipile

{1}, {T}, Sacrifice this artifact: It deals 2 damage to any target.

Into Thin Air

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Return target artifact to its owner's hand.

Artificer's Epiphany

Draw two cards. If you control no artifacts, discard a card.

Thoughtcast

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