Thraben Inspector

When Thraben Inspector enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Ancient Den

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

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

Metalcraft — Ardent Recruit gets +2/+2 as long as you control three or more artifacts.

Razortide Bridge enters tapped.
Indestructible
{T}: Add {W} or {U}.

Metalcraft — As long as you control three or more artifacts, Auriok Sunchaser gets +2/+2 and has flying.

Haste
{1}: Gingerbrute can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice Gingerbrute: You gain 3 life.

This spell costs {2} less to cast if you control a Human creature and a non-Human creature.
Draw two cards.