The key card is present but its support is thin.
Prioritize useful support such as Paladin's Arms or Gaelicat.
Play Tidus before Paladin’s Arms when the curve allows. The Equipment gives Tidus one counter and makes a nonartifact Hero; later Tidus can tap a blocker when attacking.
Your deck already enables the plan but is losing the early turns.
Take a castable early creature or efficient answer before a second expensive payoff.
A job-select Hero is not a second artifact. Count actual artifacts for Gaelicat and keep enough creatures to survive while spending four mana on Auracite.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.