When Blood Fountain enters the battlefield, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.") {3}{B}, {T}, Sacrifice Blood Fountain: Return up to two target creature cards from your graveyard to your hand.

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color. When Chromatic Star is put into a graveyard from the battlefield, draw a card.

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

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

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

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

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

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

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Counter target spell unless its controller pays {3}.

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

{T}: Add {R}.

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

{T}: Add {U}.

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