Goldmire Bridge

Goldmire Bridge enters tapped.
Indestructible
{T}: Add {W} or {B}.

Of One Mind

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

Rustvale Bridge enters tapped.
Indestructible
{T}: Add {R} or {W}.

This spell costs {1} less to cast for each artifact you control.
{5}{U}: Gearseeker Serpent can't be blocked this turn.

Whenever an artifact you control enters, Reckless Fireweaver deals 1 damage to each opponent.

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

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

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

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

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

Tap two untapped artifacts and/or creatures you control: Sunshot Militia deals 1 damage to each opponent. Activate only as a sorcery.

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

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

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