Spell Pierce

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

Seat of the Synod

Thought Monitor

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Flying
When this creature enters, draw two cards.

Ornithopter

Etherium Sculptor

Artifact spells you cast cost {1} less to cast.

Chief of the Foundry

Other artifact creatures you control get +1/+1.

Razortide Bridge

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

Counterspell

One with the Machine

Draw cards equal to the greatest mana value among artifacts you control.

Darksteel Citadel

Thoughtcast

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

Island

Silver Myr

Kappa Cannoneer

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Ward {4}
Whenever this creature or another artifact you control enters, put a +1/+1 counter on this creature. It can't be blocked this turn.

Darksteel Juggernaut

Indestructible
Darksteel Juggernaut's power and toughness are each equal to the number of artifacts you control.
This creature attacks each combat if able.

Assert Authority

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.