lol, yeah.
I think right now its.....
499+(23*23)+(8*23)+(16*23)
499 is the highest possible without killing in one turn, 23*23 is 23 retroviruses plaguing 23 voodoo dolls, 8*23 is 8 more plagues on hand, and the 16*23 is from 16 Mindgates.
The grand total is.... 1580 poison counters.
Possibly more with AntiPoison glitch, but I'm not sure.