Maat, being the paragon of truth and justice, finds dressing up and gorging on treats to be perfectly normal. After all, what could be more just than a festive holiday? She laughs, "Of course it's okay to enjoy Halloween! Let's get into it everyone!"
The "Trick of Treat'" comes from the halloween themed event this card is related to.
The name Maat comes from the Egyptian Goddess Maat. She regulated the stars, seasons and the actions of both Mortals and the deities. She brings order to chaos and one of her primary roles was the weighing of souls in the underworld determining whether they would reach the paradise of afterlife successfully.
See Trick or Treat' Maat.