Well again, technique as everyone said... but apart from a perfect technique there's still a lot of options..
And it would be speculative either way, since you never know if there's a more spiny blade or rubber out there.
Out of all the blades I've used, I have never been able to generate as much spin as I do with my current Xvt ZLC Hinoki (which is a butterfly Amultart clone... slightly slower and more control) with MX-P on fh. Although MX-P is very spinny, it's probably not the spinniest out there..Within Tibhar I'm sure Evolution MX-S would top it, just the feeling of that rubber is a bit different. And Tenergy 05 also, arguably.
Also, I rarely played with tacky sheets Like DHS Hurricane 8, which might be even spinier than all other grippy sheets. Due to that, I'll stick to speculating on non-sticky rubbers mostly.
I'll list some blades and rubbers that speculatively might be competitors.
Blades: (is really tricky, but from my experience, I think Hinoki might arguably be the spiniest wood out there, I've tried the loop king: Galaxy w6 which is a VERY spinny limba-ayous blade with HIGH flex (which might be an even bigger spin beast paired up with a tacky chinese rubber like Yogi said; Hurricane 8 perhaps), but both my current blade, and Nittaku Miyabi tops that spin with "normal" grippy rubbers like MX-P)
Off: XVT ZLC Hinoki, Darker Speed 90
all: butterfly Jonyer,
An extra note: I have tried Treiber Z+Fo+fi which are fairly spinny and also hinoki, but their hinoki top ply is far thinner, and for the blade to be "the most" spinny, the hinoki has to be at least fairly thick.
Tibhar Evolution MX-S, Tenergy 05, xiom omega v tour, Donic Bluegrip R1.
(nice reference point, but don't take it on face value without comparing)
Do note that: Not all rubbers go well with any blade,
example wise: tacky rubbers will usually not go well with hinoki top plies.
So while I said Hinoki was beast for grippy rubbers, I wouldn't recommend pairing them up with tacky rubbers for "max spin". The spin generated with tacky rubbers are more on the top sheets, while grippy rubbers also rely on the sink in features of the blade more. And that's where the hinoki wood might come out on top.
Now you just need a science team, get a number of mentioned equipment in the target zone, do tacky vs grippy, and measure each rubber against each other on different types of blades , get a player with a stable technique and a tool to measure spin rotation of the ball. Then have him/her do the shots for a number of times to measure the average on each blade (+ add in the highest spin ratio achieved on each blade)
and theeen. You can conclude. which has the highest spin possibilities and highest average based on your observations
BOOM. Best of luck.