I'd make a pygmy t-rexelcorn. That's part t-rex, unicorn, and elephant. She'd be the size of a great dane. She likes to frolic in the grass and look for treasure. She glows in the dark, and her horn is detachable. She has magical powers.
Her wings, horn, and trunk don't cast shadows as a defense mechanism. It fools predators into thinking she is a long extinct dinosaur that they don't recognize but subconsciously know will eat them.