Darksteel

{X}, {T}: Tap X target noncreature artifacts. {X}, {T}: Untap X target noncreature artifacts.

Scavenging Scarab can't block.

Whenever Tel-Jilad Wolf becomes blocked by an artifact creature, Tel-Jilad Wolf gets +3/+3 until end of turn.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) Flying When Furnace Dragon enters the battlefield, if you...

{W}, {T}: Tap target creature.

Flying Whenever Emissary of Hope deals combat damage to a player, you gain 1 life for each artifact that player controls.

Flying Discard an artifact card: Return Neurok Prodigy to its owner's hand.

Affinity for Mountains (This spell costs {1} less to cast for each Mountain you control.) Haste

{T}: Put a charge counter on target artifact. Sacrifice Coretapper: Put two charge counters on target artifact.

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.)

{1}{G}, Sacrifice Viridian Zealot: Destroy target artifact or enchantment.

{X}, {T}: Tap X target noncreature artifacts. {X}, {T}: Untap X target noncreature artifacts.

Affinity for Islands (This spell costs {1} less to cast for each Island you control.) Flying

Karstoderm enters the battlefield with five +1/+1 counters on it. Whenever an artifact enters the battlefield, remove a +1/+1 counter from Karstoderm.

When Vulshok War Boar enters the battlefield, sacrifice it unless you sacrifice an artifact.

Protection from artifacts

At the beginning of your end step, if Nim Abomination is untapped, you lose 3 life.

Flying Hoverguard Observer can block only creatures with flying.

Juggernaut attacks each combat if able. Juggernaut can't be blocked by Walls.

Flying Drill-Skimmer has shroud as long as you control another artifact creature. (It can't be the target of spells or abilities.)

{1}: Target artifact creature blocks Auriok Siege Sled this turn if able. {1}: Target artifact creature can't block Auriok Siege Sled this turn.

Whenever you gain life, put that many +1/+1 counters on Ageless Entity.