Emrakul Brood (It that Rides as One) - Knocks Thalia's hippogriff out of the sky

But then she strayed too close to a shambling thing the size of a large horse, and it wheeled on her. It had once been a horse, she guessed—no, a horse and rider, now fused together in a hideous mass of flesh. Something like six legs supported the thing, and interwoven cords of magenta flesh covered its sides, fusing what had once been rider and steed together. Jagged teeth jutted from various jaw-like structures beneath a ratty mane, and an orange glow beneath a three-cornered hat must once have been the face of the rider. A halberd was almost swallowed up in the tangle of tentacles.

Before she could even turn her mount to face the creature, as if she had entered some sort of mad tilting contest, it reared up on three hind legs and slammed a hoof into her shoulder, knocking her from the saddle. Her gryff lifted into the air with a flutter of ruffled feathers, and Thalia took advantage of the horse-creature's momentary distraction to find her feet and settle into a fighting stance.

(Saint Traft and the Flight of Nightmares)