Frogmite

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

Drossforge Bridge

This land enters tapped.
Indestructible
{T}: Add {B} or {R}.

Darksteel Citadel

Makeshift Munitions

{1}, Sacrifice an artifact or creature: This enchantment deals 1 damage to any target.

Reckless Fireweaver

Whenever an artifact you control enters, this creature deals 1 damage to each opponent.

Perilous Myr

When this creature dies, it deals 2 damage to any target.

Great Furnace

Seat of the Synod

Myr Enforcer

Silverbluff Bridge

This land enters tapped.
Indestructible
{T}: Add {U} or {R}.

Springleaf Drum

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

Of One Mind

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

Galvanic Blast

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

Experimental Synthesizer

When this artifact enters or leaves the battlefield, exile the top card of your library. Until end of turn, you may play that card.
{2}{R}, Sacrifice this artifact: Create a 2/2 white Samurai creature token with vigilance. Activate only as a sorcery.

Ingenious Artillerist

Whenever one or more artifacts you control enter, this creature deals that much damage to each opponent.

Thoughtcast

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

Ichor Wellspring

When this artifact enters or is put into a graveyard from the battlefield, draw a card.