But Bontu seems to be vastly underappreciated at the moment, and it's because of how you have to build around him. He can only attack or block if a creature under YOUR control has died in a turn. The best way to do this is to use his ability, which costs 1B - you sacrifice a creature, get to scry 1, then you gain 1 life and each opponent loses one life.
As a 4/6, he can be quite a powerhouse for only 3 mana. But what deck can consistently sacrifice creatures like this? The best example is a Mono-Black Aggro deck like this one at Pro Tour Ixalan. As a one-of, it's not bad in an aggro deck. Since you can use the sacrifice ability at instant speed, you can sacrifice creatures that would have otherwise died to removal or in combat, anyway. Bontu also has great synergies with creatures like Bone Picker, Dread Wanderer, Scrapheap Scrounger and Yahenni, Undying Partisan.
I was able to pick up a copy of Bontu the Glorified on CardSphere for $1.36, which is roughly $0.35 less than his TCGPlayer market price right now. This sounds cheap, but Bontu's stock is relatively low at the moment. But with his price bottoming out at $2 recently, as a useful mythic rare from a good set, this is a reasonable floor. I can't see him not hitting $4 again during his time in Standard. But $6 or even $8 is possible if Bontu lands in a top 8 Standard list.
There's so little risk with Bontu, especially as he sees a fair amount of play in EDH; the popular Meren of Clan Nel Toth likes to have him. If he even hits $3, I'm more than happy and I'm sure I'll just be holding him for a long while. I'm definitely a buyer at $2 and below.