Found this out after a bit of testing doing pony runs w/ high magic find. If this is a repost sorry
If you cast hydra while wearing your max dps gear, then switch gear to max MF gear, the hydra's retain the dps amount from the gear they were originally cast in.
This allows you to not worry about the stats on your magic find as a wizard. Very good for getting mobs to ~100k then casting poison hydra and running around the hydra. Also for the pony run glitch to save time rather than hitting for 2k in inferno.
Enjoy
Z