Silverbluff Bridge

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

Galvanic Blast

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

Indestructible (Effects that say "destroy" don't destroy this artifact.)

{T}: Add {C}.
{T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

Enchant artifact
Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types.

Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on it.

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.

Sacrifice Welding Jar: Regenerate target artifact.

Counter target spell unless its controller pays {3}.

Fire deals 2 damage divided as you choose among one or two targets.

Draw three cards. Then discard two cards unless you discard an artifact card.

When Ichor Wellspring enters or is put into a graveyard from the battlefield, draw a card.

Affinity for artifacts
Flying
When Thought Monitor enters, draw two cards.