The key card is present but its support is thin.
Prioritize useful support such as Timid Shieldbearer or Clachan Festival.
Festival supplies two Kithkin triggers for Lieutenant. Council later costs less with a Kithkin and replaces itself while adding another attacker.
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.
Temporary Lieutenant boosts vanish at end of turn. Make the creatures before combat if those boosts are meant to push damage.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.