Having seen many cursed Pooh and Mickey artworks since their release into public domain, the pony dangles mickey and pooh doll on a stick as some sort of curse lightning rod.
The pony thus become resistant or even immune to curses or cursed spells, since the dolls redirects curse energy onto themselves, becoming more cursed and demonic as they absorb curses. When the dolls have reached peak cursed, they spring to life and indiscriminately attack anything within range until it runs out of cursed energy, or defeated. Once empty, they can be reused as curse sponges.