Have

Tezzeret's Gatebreaker

When Tezzeret's Gatebreaker enters the battlefield, look at the top five cards of your library. You may reveal a blue or artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
{5}{U}, {T}, Sacrifice Tezzeret's Gatebreaker: Creatures you control can't be blocked this turn.

Tezzeret's Strider

As long as you control a Tezzeret planeswalker, Tezzeret's Strider has menace. (It can't be blocked except by two or more creatures.)

Scholar of Stars

When Scholar of Stars enters the battlefield, if you control an artifact, draw a card.

Gearsmith Prodigy

Gearsmith Prodigy gets +1/+0 as long as you control an artifact.

Skilled Animator

When Skilled Animator enters the battlefield, target artifact you control becomes an artifact creature with base power and toughness 5/5 for as long as Skilled Animator remains on the battlefield.

Manalith

Island

Gearsmith Guardian

Gearsmith Guardian gets +2/+0 as long as you control a blue creature.

Riddlemaster Sphinx

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Riddlemaster Sphinx enters the battlefield, you may return target creature an opponent controls to its owner's hand.

Exclusion Mage

When Exclusion Mage enters the battlefield, return target creature an opponent controls to its owner's hand.

Uncomfortable Chill

Creatures your opponents control get -2/-0 until end of turn.
Draw a card.

Dwindle

Enchant creature
Enchanted creature gets -6/-0.
When enchanted creature blocks, destroy it. (The attacking creature remains blocked.)

Pendulum of Patterns

When Pendulum of Patterns enters the battlefield, you gain 3 life.
{5}, {T}, Sacrifice Pendulum of Patterns: Draw a card.

Field Creeper

Divination

One with the Machine

Draw cards equal to the highest mana value among artifacts you control.

Snapping Drake

Flying (This creature can't be blocked except by creatures with flying or reach.)

Tezzeret, Cruel Machinist

+1: Draw a card.
0: Until your next turn, target artifact you control becomes a 5/5 creature in addition to its other types.
−7: Put any number of cards from your hand onto the battlefield face down. They're 5/5 artifact creatures.

Meteor Golem

When Meteor Golem enters the battlefield, destroy target nonland permanent an opponent controls.