Excruciator

• WWizards of the Coast2005-10-01
  Official Ruling
  Replacement effects that don’t use the word “prevent” can replace Excruciator’s damage with something else. See Phytohydra and Szadek, Lord of Secrets, for example.
• WWizards of the Coast2005-10-01
  Official Ruling
  An effect may redirect Excruciator’s damage.
• WWizards of the Coast2005-10-01
  Official Ruling
  Excruciator can deal damage to creatures with protection from red. (It can’t block creatures with protection from red, though.)
• WWizards of the Coast2005-10-01
  Official Ruling
  A creature dealt lethal damage by Excruciator can be regenerated.
• WWizards of the Coast2005-10-01
  Official Ruling
  Damage prevention shields that would prevent this damage aren’t used up and they stick around for the next time something would deal damage.

Rulings via Scryfall