Dross Golem

Affinity for Swamps (This spell costs {1} less to cast for each Swamp you control.)
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Atog

Sacrifice an artifact: Atog gets +2/+2 until end of turn.

Nim Lasher

Nim Lasher gets +1/+0 for each artifact you control.

Energy Chamber

At the beginning of your upkeep, choose one —
• Put a +1/+1 counter on target artifact creature.
• Put a charge counter on target noncreature artifact.

Mountain

Vault of Whispers

Swamp

Great Furnace

Bonesplitter

Frogmite

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

Slobad, Goblin Tinkerer

Sacrifice an artifact: Target artifact gains indestructible until end of turn.

Myr Enforcer

Myr Retriever

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

Arcbound Ravager

Sacrifice an artifact: Put a +1/+1 counter on Arcbound Ravager.
Modular 1 (This creature enters the battlefield with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)