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.

Mishra's Factory

{T}: Add {C}.
{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Mountain

Ankh of Mishra

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

Chaos Orb

{1}, {T}: If this artifact is on the battlefield, flip it onto the battlefield from a height of at least one foot. If this artifact turns over completely at least once during the flip, destroy all nontoken permanents it touches. Then destroy this artifact.

Blood Moon

Goblin Balloon Brigade

{R}: This creature gains flying until end of turn.

Swamp

Stone Rain

Dingus Egg

Whenever a land is put into a graveyard from the battlefield, this artifact deals 2 damage to that land's controller.

Strip Mine

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

Mox Jet

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Sinkhole

Mox Ruby

Sol Ring

Juzám Djinn

At the beginning of your upkeep, this creature deals 1 damage to you.

Winter Orb

As long as this artifact is untapped, players can't untap more than one land during their untap steps.

Manabarbs

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.