Ruric Thar, the Unbowed

Legendary creature - Ogre Warrior
Vigilance, reach.
Ruric-Thar, the Unbowed attacks each turn if able.
Whenever a player casts a non-creature spell, Ruric Thar deals 6 damage to that player.
6/6
The first thing that came to mind was that it might be a reasonable Oath/Dredge sideboard option if combo ever makes a big comeback. Pyrostatic Pillar is backbreaking enough as a single enchantment in play. Tripling that effect is harsh.
I also wonder if there's some sort of ramp context where this can be Forced through early with a Cavern of Souls. That is a very potent static ability, up there with Iona.
Also, the name of the next block's expansions were released today: Theros, Born of the Gods, and Journey into Nyx.