You have the payoff but too few ways to activate it.
Look for Consuming Ashes.
Exile an opposing creature to commit a crime, return Campaign to hand, and recast it on a later turn for another card.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Campaign returns only from the battlefield. Its enter ability has no target and does not itself commit a crime.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.