Activate Umbral Collar Zealot by sacrificing Trapjaw Kelpie.
When Trapjaw Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Vizier of Remedies.
Resolve the Umbral Collar Zealot ability
Repeat.
This crafty loop turns the relentless return of Trapjaw Kelpie into a self-sustaining engine by relying on Vizier of Remedies to completely mitigate the creature's drawback, preventing the persist ability from ever fizzling out. With that counter prevention firmly in place, Umbral Collar Zealot gladly accepts the repeated sacrifices of the Kelpie as fuel, turning the endless cycle of death and resurrection into an infinite stream of triggers while letting you filter through your deck with endless surveil.