The key card is present but its support is thin.
Prioritize useful support such as Agents of HYDRA or HYDRA Assault Robot.
With the Robot in play, Agents of HYDRA supplies an enter trigger and another when it dies into its Villain token. Madame Hydra rewards casting future Villain spells.
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.
Madame Hydra triggers on casting a Villain spell; creating a Villain token does not itself trigger her.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.