Looking for themes in each color, I noticed that black has two regenerating creatures, and one which triggers an ability when it regenerates. So, I decided to work with a 'regeneration matters' theme, changed the trigger on the previous card to trigger whenever any creature regenerates, then chose 'black regeneration matters card' and the random generator gave me Sadistic Augermage.

Since I wanted to keep the base stats, I made this creature regenerate everything when it activated. All the better for 'regeneration matters' anyways. The mill effect was a bit of a mistake at first. I assumed, since this guy came from Ravnica, that he milled. Actually, the augurmage sets up a mill effect, but it's still in the same country. Besides, this is a good "Doesn't matter, but matters" effect. A couple of these and a couple of Hurloon Mazemasters and you got the makings of a decent occasional mill deck.