Fight to the Death — ruling 1

A “blocking creature” is one that has been declared as a blocker this combat, or one that was put onto the battlefield blocking this combat. Unless that creature leaves combat, it continues to be a blocking creature through the end of combat step, even if the creature or creatures that it was blocking are no longer on the battlefield or have otherwise left combat by then.

Fight to the Death — ruling 2

A “blocked creature” is an attacking creature that has been blocked by a creature this combat, or has become blocked as the result of a spell or ability this combat. Unless the attacking creature leaves combat, it continues to be a blocked creature through the end of combat step, even if the creature or creatures that blocked it are no longer on the battlefield or have otherwise left combat by then.

Fight to the Death — ruling 3

Attacking creatures that haven’t been blocked are unaffected by Fight to the Death.

Fight to the Death — ruling 4

If Fight to the Death is cast before blockers are declared or after combat ends, it won’t do anything.

Fight to the Death : règles, fonctionnement et interactions (MTG)

Fight to the Death 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

Destroy all blocking creatures and all blocked creatures.

How it works : Fight to the Death

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2009· Wizards of the Coast
A “blocking creature” is one that has been declared as a blocker this combat, or one that was put onto the battlefield blocking this combat. Unless that creature leaves combat, it continues to be a blocking creature through the end of combat step, even if the creature or creatures that it was blocking are no longer on the battlefield or have otherwise left combat by then.
No other card is named in this ruling.
#2May 1, 2009· Wizards of the Coast
A “blocked creature” is an attacking creature that has been blocked by a creature this combat, or has become blocked as the result of a spell or ability this combat. Unless the attacking creature leaves combat, it continues to be a blocked creature through the end of combat step, even if the creature or creatures that blocked it are no longer on the battlefield or have otherwise left combat by then.
No other card is named in this ruling.
#3May 1, 2009· Wizards of the Coast
Attacking creatures that haven’t been blocked are unaffected by Fight to the Death.
No other card is named in this ruling.
#4May 1, 2009· Wizards of the Coast
If Fight to the Death is cast before blockers are declared or after combat ends, it won’t do anything.
No other card is named in this ruling.