Myr Enforcer

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

Gearseeker Serpent

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

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

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

Sacrifice Welding Jar: Regenerate target artifact.

Target creature can't be blocked this turn.
Flashback {U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Put a +1/+1 counter and a lifelink counter on target creature.

({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.)

Mistvault Bridge enters the battlefield tapped.
Indestructible
{T}: Add {U} or {B}.

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

When Ichor Wellspring enters the battlefield or is put into a graveyard from the battlefield, draw a card.