Thorn Elemental

You may have this creature assign its combat damage as though it weren't blocked.

The first law of Yavimaya is that guests may kill only to survive. As fires aren't needed in the warm weather, cutting trees for wood means death.

Dominaria

You may have Thorn Elemental assign its combat damage as though it weren't blocked.

Rain from this storm leaves you pinned to the ground like an insect.

Eighth Edition

You may have Thorn Elemental deal its combat damage to defending player as though it weren't blocked.

Seventh Edition

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

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.

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.