The key card is present but its support is thin.
Prioritize useful support such as Mob Lookout or Swarm, Being of Bees.
Connive a counter onto Lizards, then cast a discounted four-mana-value spell to add another. Use the larger body for a safer Kapow fight.
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.
Kapow still requires your creature to survive the fight. A large power boost alone does not guarantee a profitable exchange.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.