Court Homunculus

This creature gets +1/+1 as long as you control another artifact.

Filigree Attendant

Flying
Filigree Attendant's power is equal to the number of artifacts you control.

Frogmite

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

Littjara Kinseekers

Changeling (This card is every creature type.)
When this creature enters, if you control three or more creatures that share a creature type, put a +1/+1 counter on this creature, then scry 1.

Myr Enforcer

Razortide Bridge

This land enters tapped.
Indestructible
{T}: Add {W} or {U}.

Three Tree Mascot

Changeling (This card is every creature type.)
{1}: Add one mana of any color. Activate only once each turn.

Ancient Den

Darksteel Citadel

Gearseeker Serpent

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
{5}{U}: This creature can't be blocked this turn.

Thoughtcast

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

Plains

Island

Seat of the Synod

Universal Automaton

Changeling (This card is every creature type.)

Lens Flare

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Lens Flare deals 5 damage to target attacking or blocking creature.