You have the payoff but too few ways to activate it.
Look for Daring Waverider.
Waverider reuses a small instant or sorcery; casting that spell can trigger Mentor’s prowess even though no mana was paid.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Too many creatures starve your spell payoffs, but too few leave you unable to attack. Harnesser’s permission expires at end of turn.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.