The effect of luck and the tsuchinoko

The idea is use the tsuchinoko a yokai of the japanese culture, this yokai is a mitical snake that is really difficult to see and caught, but  if you see any you will have luck, i think this is a good idea, because the tsuchinoko is a mythological animal and it doesnt exist, the only problem how i see is the name, but i think you can get original names or leave the name of tsuchinoko.

The best part of this mob is when you are close to one you will have the effect of luck, and if you kill it you will have the effect of unluck, like a dolphin, the tsuchinoko according the legend is a peaceful creature and it doesnt attack people, you can see it in the new mountains like the legend and it have a very low chance to apearring but if you see it you can attract it with honey or honeycomb.

its special characteristic would be that it would be the mob with the least chance of appearing

i think is a excellent idea for a new mob and the players would travel arround the world to find it.

i dont speak english and i am learning, so sorry if there is something misspelled.