I do.
I took 4g of P. Subaeruginosa and between 1/2 and a full gram of ketamine over the duration of the trip.
It was actually my favourite mushroom trip. I spent much of the duration of the trip lying down with an enormous smile on my face, in contact with a fractal goddess who was making me laugh so hard that I had to pray to her to tone it down a bit so that I could actually breathe because it was getting to the point where at times I seriiously couldnt breathe and I was getting a bit worried.
Other than that it was highly enjoyable and the CEV's were phenominal. The body and mental euphoria was very strong as well. Id definitely do it again but at a smaller dose of 2.5-3g of mushrooms but the same amount of ketamine.
LSD and ketamine is another one of my favourite combos, especially with nitrous and even some MDMA. Ive had incredibly strong OEV's and CEV's almost every time that ive done it. I often see spirits or "Ghosts". See through, benevolent entities that just seem like normal people walking around minding their own business. Nitrous brings it to an entirely new level and one that can be overwhelmingly intense. I was catapulted into a white, heaven like space with Buddha meditating right in front of me and along with that came the feeling of being in the presence of greatness in a way ive never felt before and was a truly lifechanging experience but to the people I was with, it scared the shit out of them as from the outside it looked like I was having a bad time but really I was just incredibly shocked at what I was seeing and experiencing. It took awhile to calm them down and for them to know I actually had a profound experience and I felt really bad that I scared them. Not to mention it sounded bonkers that I had just met buddha and noone understood in the slightest.
Tread carefully.