Great Sable Stag — ruling 1

Great Sable Stag can be targeted by spells that try to counter it (such as Cancel). Those spells will resolve, but the part of their effect that would counter Great Sable Stag won’t do anything. Any other effects those spells have will work as normal.

Great Sable Stag — ruling 2

Although the reminder text doesn’t say so, Great Sable Stag also can’t be equipped by blue or black Equipment.

Great Sable Stag : règles, fonctionnement et interactions (MTG)

Great Sable Stag 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

This spell can't be countered. Protection from blue and from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything blue or black.)

How it works : Great Sable Stag

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
Great Sable Stag can be targeted by spells that try to counter it (such as Cancel). Those spells will resolve, but the part of their effect that would counter Great Sable Stag won’t do anything. Any other effects those spells have will work as normal.
No other card is named in this ruling.
#2October 1, 2009· Wizards of the Coast
Although the reminder text doesn’t say so, Great Sable Stag also can’t be equipped by blue or black Equipment.
No other card is named in this ruling.