Gearsmith Prodigy

Gearsmith Prodigy gets +1/+0 as long as you control an artifact.

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Riddlesmith

Whenever you cast an artifact spell, you may draw a card. If you do, discard a card.

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

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

When Aviation Pioneer enters, create a 1/1 colorless Thopter artifact creature token with flying.

{T}: Put a +1/+1 counter on each artifact creature you control.