You have the payoff but too few ways to activate it.
Look for Chupacabra Echo.
Marionette can trade and mill permanent cards. Echo turns that stocked graveyard into a larger toughness reduction.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Instants and sorceries do not count toward descend. Reanimating your largest threat also reduces the permanent count.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.