Battered Golem

Battered Golem doesn't untap during your untap step.
Whenever an artifact enters, you may untap Battered Golem.

Kessig Flamebreather

Whenever you cast a noncreature spell, Kessig Flamebreather deals 1 damage to each opponent.

Flying
Whenever you cast an artifact spell, you may untap target creature.

Whenever an artifact you control enters, Reckless Fireweaver deals 1 damage to each opponent.

Until end of turn, target creature gains "{T}: Return target nonland permanent to its owner's hand."

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

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

Flash
Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
{T}: Target creature gets +1/+0 until end of turn.