Spire of Industry

{T}: Add {C}.
{T}, Pay 1 life: Add one mana of any color. Activate only if you control an artifact.

Springleaf Drum

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

Erayo's Essence

Whenever an opponent casts their first spell each turn, counter that spell.

Erayo, Soratami Ascendant

Flying
Whenever the fourth spell of a turn is cast, flip Erayo, Soratami Ascendant.

Erayo, Soratami Ascendant // Erayo's Essence

Plains

Spell Pierce

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

Dispatch

Tap target creature.
Metalcraft — If you control three or more artifacts, exile that creature.

Aven Mindcensor

Flash
Flying
If an opponent would search a library, that player searches the top four cards of that library instead.

Tocatli Honor Guard

Creatures entering the battlefield don't cause abilities to trigger.

Dispel

Memnite

Ornithopter

Court Homunculus

Court Homunculus gets +1/+1 as long as you control another artifact.

Repeal

Return target nonland permanent with mana value X to its owner's hand.
Draw a card.

Master of Etherium

Master of Etherium's power and toughness are each equal to the number of artifacts you control.
Other artifact creatures you control get +1/+1.

Island

Portable Hole

When Portable Hole enters the battlefield, exile target nonland permanent an opponent controls with mana value 2 or less until Portable Hole leaves the battlefield.

Steel Overseer

{T}: Put a +1/+1 counter on each artifact creature you control.

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Chimeric Mass

Chimeric Mass enters the battlefield with X charge counters on it.
{1}: Until end of turn, Chimeric Mass becomes a Construct artifact creature with "This creature's power and toughness are each equal to the number of charge counters on it."