I’m going off wikipedia for that, which seems to suggest the usual formula is ket + mdma + street “coke” — but with that “coke” being the usual adulterated mix of 5-10% real cocaine heavily cut down by levamisole, caffeine, meth, lidocaine, and inert filler. (Street mdma and ket are often cut with some of those too but hard to say how much they’re contributing.)

https://en.wikipedia.org/wiki/Tusi_(drug)#Pharmacology