Drossforge Bridge

Drossforge Bridge enters the battlefield tapped.
Indestructible
{T}: Add {B} or {R}.

Ornithopter

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

Galvanic Blast deals 2 damage to any target.
Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts.

Mistvault Bridge enters the battlefield tapped.
Indestructible
{T}: Add {U} or {B}.

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

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

Lightning Bolt deals 3 damage to any target.

Target creature gets +1/+0 until end of turn for each artifact you control.

Silverbluff Bridge enters the battlefield tapped.
Indestructible
{T}: Add {U} or {R}.

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