Mesmerizing Benthid
Creature — Octopus
When this creature enters, create two 0/2 blue Illusion creature tokens with "Whenever this token blocks a creature, that creature doesn't untap during its controller's next untap step."
This creature has hexproof as long as you control an Illusion.
Kev Walker
Ravnica Allegiance (RNA)
• #43Rulings
The triggered ability of the Illusion tokens doesn't tap the attacking creature if it's untapped, most likely because it has vigilance.
(wotc • 2019-01-25)
Mesmerizing Benthid has hexproof as long as you control any Illusion, not just Illusion tokens like the ones created by its first ability.
(wotc • 2019-01-25)
Rulings
The triggered ability of the Illusion tokens doesn't tap the attacking creature if it's untapped, most likely because it has vigilance.
(wotc • 2019-01-25)
Mesmerizing Benthid has hexproof as long as you control any Illusion, not just Illusion tokens like the ones created by its first ability.
(wotc • 2019-01-25)