The key card is present but its support is thin.
Prioritize useful support such as Devoted Duelist or Unending Whisper.
Cast Unending Whisper first, then Effortless Master. Master counts its own casting and enters with two counters as the second spell.
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.
Master needs to be the second spell or later, not two spells after two earlier spells. Do not waste removal simply to meet a count.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.