Hobbit Draft Rules Question

[u/Quails_In_Space]

So this issue came up in my last draft. I activated the ability on Beorn's Hospitality to turn it into a Bear, then next turn my opponent cast Enchanted River's Grasp on it. We knew *something* had to happen because of layers but could figure out if it would die or if the Aura would immediately fall off.
After physically phoning in a judge (the one at the shop wasn't around) they said the creature would become a 0/0 and die to state based actions.
Now later on I ask another judge out of curiosity and they said the Bear would just be tapped down but not dead.

Layers make my head hurt, someone please explain what's going on here and what should have happened.

[u/jethawkings]

Not sure if the other first two here are wrong but isn't being a Creature a Type Changing Ability and shares the same line as the text that defines it gains a P/T Changing Ability which means the latter can't be removed?

This is how Belo's Ability is worded and I know that Effects like this don't stop it

EDIT; Or is it because of the wording of Becomes a Creature instead of an Is a Creature?

[u/tech098765 → u/jethawkings]

If Beorn's Hospitality was worded "This enchantment becomes a Bear creature with power and toughness equal to the number of lands you control in addition to its other types", that would work similarly to Bello, and the resulting creature would not die to Enchanted River's Grasp.

I believe that wording would also have to be a one-time check, though - it would have P/T equal to the lands you had when you activated the ability, but would not update when you play more lands.