That's a lot of text that could just be replaced with persist (see Putrid Goblin).

Putting deathtouch and persist (or this set of equivalent abilities) alone would put a card at uncommon or higher rarity. With the ability to infinitely persist on the battlefield, while also outright killing opposing creatures with deathtouch could make for a potential rare.

Maybe use Rogue over Thief (see Audacious Thief)?