Mishra's Workshop

{T}: Add {C}{C}{C}. Spend this mana only to cast artifact spells.

Dispel

Traumatize

Target player mills half their library, rounded down.

Tale's End

Counter target activated ability, triggered ability, or legendary spell.

Tolarian Academy

{T}: Add {U} for each artifact you control.

Academy Ruins

{T}: Add {C}.
{1}{U}, {T}: Put target artifact card from your graveyard on top of your library.

Undermine

Counter target spell. Its controller loses 3 life.

Evincar's Justice

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Evincar's Justice deals 2 damage to each creature and each player.

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.

Candelabra of Tawnos

Lady Octopus, Inspired Inventor

Whenever you draw your first or second card each turn, put an ingenuity counter on Lady Octopus.
{T}: You may cast an artifact spell from your hand with mana value less than or equal to the number of ingenuity counters on Lady Octopus without paying its mana cost.

Thran Dynamo

Fraying Sanity

Enchant player
At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn.

Peregrine Drake

Flying
When this creature enters, untap up to five lands.

Spell Pierce

Counter target noncreature spell unless its controller pays {2}.

Stifle

Counter target activated or triggered ability. (Mana abilities can't be targeted.)

Cavern Harpy

Flying
When this creature enters, return a blue or black creature you control to its owner's hand.
Pay 1 life: Return this creature to its owner's hand.