The key card is present but its support is thin.
Prioritize useful support such as Cryogen Relic or Selfcraft Mechan.
Play Cryogen Relic, then sacrifice it to Selfcraft Mechan. The Relic’s leave trigger adds a separate card to the Mechan’s counter-and-draw reward.
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.
Expensive artifacts are not all disposable. Keep enough early creatures and cheap artifacts to pay costs without giving away the board.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.