Go for Blood — ruling 1

If either target is an illegal target as Go for Blood resolves, no creature will deal or be dealt damage.

Go for Blood : règles, fonctionnement et interactions (MTG)

Go for Blood 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

Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.) Cycling (, Discard this card: Draw a card.)

How it works : Go for Blood

Original English text — Wizards of the Coast / Scryfall

#1April 17, 2020· Wizards of the Coast
If either target is an illegal target as Go for Blood resolves, no creature will deal or be dealt damage.
No other card is named in this ruling.