The key card is present but its support is thin.
Prioritize useful support such as Glamermite or Unwelcome Sprite.
With Tome-Skimmer present, cast Glamermite during the opponent’s turn to draw for one life and tap a relevant attacker or blocker.
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.
Do not pass an empty turn simply to represent a spell. Develop your board when you have no profitable instant-speed play.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.