This is Magic Spell, the custom I created for this year's MLP Arena Halloween Custom Swap. Also the forth consecutive Halloween Custom Swap that I've done a witch pony.
Her hat, mask, and tail ring were done with Apoxie Clay with jewels added. The jewel in her symbol was original to her design and the rest of the symbol was hand painted, as were the eyes. Her hair is a blend of Dollyhair Evil Enchantress, Deadly Nightshade, Hematite, and Venom, and I'm quite fond of this blend.