Chromatic Sphere

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

Frantic Search

Draw two cards, then discard two cards. Untap up to three lands.

Aladdin's Ring

{8}, {T}: This artifact deals 4 damage to any target.

Glasses of Urza

Cathodion

Counterspell

Ornithopter

Enervate

Tap target artifact, creature, or land.
Draw a card at the beginning of the next turn's upkeep.

Animate Artifact

Enchant artifact
As long as enchanted artifact isn't a creature, it's an artifact creature with power and toughness each equal to its mana value.

Accumulated Knowledge

Draw a card, then draw cards equal to the number of cards named Accumulated Knowledge in all graveyards.

Bronze Horse

Trample
As long as you control another creature, prevent all damage that would be dealt to this creature by spells that target it.

Tinker

As an additional cost to cast this spell, sacrifice an artifact.
Search your library for an artifact card, put that card onto the battlefield, then shuffle.