You can decide to assign damage to the defending player or planeswalker even if the blocking creature has protection from green or damage preventing effects on it.

When assigning combat damage, you choose whether you want to assign all damage to blocking creatures, or if you want to assign all of it to the player or planeswalker this creature is attacking. You can’t split the damage assignment between them.

If blocked by a creature with banding, the defending player decides whether or not the damage is assigned “as though it weren’t blocked”.

Rhox : règles, fonctionnement et interactions (MTG)

Rhox is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

You may have this creature assign its combat damage as though it weren't blocked. : Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

How it works : Rhox

Original English text — Wizards of the Coast / Scryfall

#1April 27, 2018· Wizards of the Coast
You can decide to assign damage to the defending player or planeswalker even if the blocking creature has protection from green or damage preventing effects on it.
No other card is named in this ruling.
#2April 27, 2018· Wizards of the Coast
When assigning combat damage, you choose whether you want to assign all damage to blocking creatures, or if you want to assign all of it to the player or planeswalker this creature is attacking. You can’t split the damage assignment between them.
No other card is named in this ruling.
#3April 27, 2018· Wizards of the Coast
If blocked by a creature with banding, the defending player decides whether or not the damage is assigned “as though it weren’t blocked”.
No other card is named in this ruling.