The ability has no effect when a creature with trample is blocking or is dealing noncombat damage
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it.) Illustrated by Steve Ellis Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
This can only be activated at sorcery-speed, still this is a powerful ability
Its signpost uncommon, Station Monitor, rewards you for double-spelling by creating a 1/1 flying token
It enters tapped, and it doesnt untap in your untap step, so thats a shame
Beyond that, being a Zombie and a Dragon opens up the possibility for tribal synergies