You have the payoff but too few ways to activate it.
Look for Hollow Marauder.
Naturalist helps find mana and puts creature cards in the graveyard, reducing Marauder’s cost and stocking recursion targets.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Marauder’s discount counts creature cards, not every graveyard card. Avoid milling so much that a long game empties your library.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.