Unknown DC Villain 0001

Details
This villain appeared in "Sister Act" which is a 4 page mini comic in the TV Guide Magazine Comic-Con Special issue that came out in July 2015.

This villain is most likely a Fort Rozz escapee. Just in case this helps in any way with identification... here are the credits for the comic:
 * Written by Andrew Kreisberg & Greg Berlanti & Ali Adler
 * Art by Xermanico
 * Colors by Alejandro Sanchez
 * Letters by Wes Abbott
 * Edited by Jim Chadwick
 * Supergirl based on the characters created by Jerry Siegel and Joe Shuster.
 * By Special Arrangement with the Jerry Siegel Family.

Powers and Abilities
He is able to shoot the horn out of his head like a little missile. It looks like it explodes on impact, but that could just be art from Supergirl being hit with anything.

"Sister Act" Comic-Con TV Guide Magazine Comic

 * 1 Major blow with his head horn to Supergirl's chest
 * 1 Major blow against him from Super-Girl
 * 1 He was defeated by possible death

Links And More Information
None