Ornithopter

Unwinding Clock

Untap all artifacts you control during each other player's untap step.

Tree of Tales

Infinite Hourglass

At the beginning of your upkeep, put a time counter on Infinite Hourglass.
All creatures get +1/+0 for each time counter on Infinite Hourglass.
{3}: Remove a time counter from Infinite Hourglass. Any player may activate this ability but only during any upkeep step.

Living Wall

Defender (This creature can't attack.)
{1}: Regenerate Living Wall.

Ancient Den

Junktroller

Defender
{T}: Put target card from a graveyard on the bottom of its owner's library.

Mirrorworks

Whenever another nontoken artifact you control enters, you may pay {2}. If you do, create a token that's a copy of that artifact.

Spellbook

Winter Orb

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

High Alert

Each creature you control assigns combat damage equal to its toughness rather than its power.
Creatures you control can attack as though they didn't have defender.
{2}{W}{U}: Untap target creature.

Black Vise

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

Mycosynth Golem

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Artifact creature spells you cast have affinity for artifacts. (They cost {1} less to cast for each artifact you control.)

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Helm of Awakening

Springleaf Drum

{T}, Tap an untapped creature you control: Add one mana of any color.

Wall of Junk

Defender (This creature can't attack.)
When Wall of Junk blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)