The Black Market Brawlers items are awesome
So, why don't we have these in the regular game?
It shows how much more can be done with items that hasn't been attempted in the normal version of the game.
The one that makes you look like an ally champion... priceless.
Which is the real ADC and which is the malphite? Mawahaha.
Seriously should consider adding items from other game modes to SR.

as just a start to to pain it would cause.
basically turns Nasus's niche in the toplane into an item,
+
is evidently pretty broken on Malzahar, and
gives mobility to people who really shouldn't have it (Use Ashe, kite them, when they dash/flash to you use the active, spam Laugh over their body).
. It gives you all the sustain you need in lane and now you have a champ who has infinitely scaling AD and HP. Rush Fleshreaver and you become very difficult to remove from lane, and then you can just build tank items and still be viable because you're Sion, and over the course of stacking it your abilities all start doing some pretty obscene damage.
active could be a nice ultimate on a new champion. But as an item it's just too interesting. People would buy it even if it wasn't the best choice of action just for the fun.