Silverbluff Bridge

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

Thoughtcast

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

Draw three cards, then put two cards from your hand on top of your library in any order.

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

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

Counter target noncreature spell unless its controller pays {2}.