Frogmite

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

Icehide Golem

({S} can be paid with one mana from a snow source.)

Steel Overseer

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

Ornithopter

Snow-Covered Plains

Swooping Lookout

Springleaf Drum

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

Plated Onslaught

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Creatures you control get +2/+1 until end of turn.

Esper Sentinel

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is Esper Sentinel's power.

Dispatch

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

Tempered Steel

Artifact creatures you control get +2/+2.

Memnite

Toolcraft Exemplar

At the beginning of combat on your turn, if you control an artifact, Toolcraft Exemplar gets +2/+1 until end of turn. If you control three or more artifacts, it also gains first strike until end of turn.