What if a newly-levelled 5th level druid wildshapes into a wolverine, then enters into a huge, campaign-defining battle that lasts five hours, climaxing with the defeat of the BBEG who has been the PC's nemesis throughout the campaign to this point, resulting in an experience award of 5000xp to the druid? No artifacts involved, but for the length of the previous level, he had three natural weapons, which by the quote I've provided above in your own words is sufficient for you to allow him to take Multiattack.