Fling

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

Galvanic Blast

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

Metalcraft — Carapace Forger gets +2/+2 as long as you control three or more artifacts.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

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

You may play an additional land this turn.
Draw a card.

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

This spell costs {1} less to cast for each artifact you control.
{5}{U}: Gearseeker Serpent can't be blocked this turn.