I think the downside to this idea is that you can wildshape into alot of stuff, but the duration is low. Like 0 hours low. Master of Many forms doesn't appear to raise the duration of wild shape at all and since you aren't a bison, and don't have it from any other source...
For confirmation, see the sample master of many forms in Complete Adventurer.. druid 5/momf 2, has 5 hour duration wild shape.
For confirmation, see the sample master of many forms in Complete Adventurer.. druid 5/momf 2, has 5 hour duration wild shape.