When Naru Meha enters the battlefield, it triggers, targeting Afterlife from the Loam.
Holding priority, activate Umbral Collar Zealot by sacrificing Naru Meha.
Resolve the Naru Meha trigger, copying Afterlife from the Loam, targeting Naru Meha and any other creature(s) as desired.
Resolve the copy of Afterlife from the Loam, returning the targeted creatures from your graveyard to the battlefield.
Repeat from step 3.
This clever loop centers on the recursive power of Afterlife from the Loam, which reaches into graveyards to resurrect creatures under your control. By casting Naru Meha, Master Wizard into the mix, you get a convenient trigger to copy the original spell and keep the chain of reanimation going. Because Naru Meha itself is brought back to the battlefield by the copied spell, you can continuously sacrifice it to Umbral Collar Zealot's activation to feed your graveyard and fuel the surveil engine.