Makeshift Munitions

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

Glaze Fiend

Flying
Whenever another artifact you control enters, this creature gets +2/+2 until end of turn.

({B/P} can be paid with either {B} or 2 life.)
Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Lightning Bolt deals 3 damage to any target.

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

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

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

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