I really wanted that +1 energy bonus item that you get when you have all 3 rare items. I have always regretted not having "bought" that when it was the price of an LTQ a long time ago.
The Carnage crates are not cheap: 90 gold for 1 or 250 for 3.
But the drop rate is 8% according to gree.
I had to buy 111 crates to get my 3rd rare which is a drop rate of only 2.7% !
And then I consider myself lucky, I got 3 different rares from the first time.
So my advice to y'all: stay away from this.