Mountain

Iron Myr

Black Vise

As this artifact enters, choose an opponent.
At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is the number of cards in their hand minus 4.

Memnite

The Rack

As this artifact enters, choose an opponent.
At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand.

Jhoira, Weatherlight Captain

Whenever you cast a historic spell, draw a card. (Artifacts, legendaries, and Sagas are historic.)

Frogmite

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

Ankh of Mishra

Whenever a land enters, this artifact deals 2 damage to that land's controller.

Counterspell

Phyrexian Walker

Island

Unsummon

Return target creature to its owner's hand.