no, because hexproof protects from abilities as well, which is what Thornbite Staff is granting. the creature would be dealing damage via the ability gained from the Thornbite Staff, and a creature with hexproof cannot be targeted by abilities an opponent controls.
June 24, 2017 8:20 p.m.
Thank you, just wanted a bit more clarification on it since it said the creature was dealing the damage.
June 24, 2017 8:25 p.m.
Glaring Spotlight is the answer to ask your concerns, run a set in the sideboard for dealing with hexproof if you know you're going to see it