Invoke Prejudice — ruling 1

In a multi-player game, it affects all opposing players.

Invoke Prejudice — ruling 2

This ability triggers when the spell is cast.

Invoke Prejudice : règles, fonctionnement et interactions (MTG)

Invoke Prejudice 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

Whenever an opponent casts a creature spell that doesn't share a color with a creature you control, counter that spell unless that player pays , where X is its mana value.

How it works : Invoke Prejudice

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
In a multi-player game, it affects all opposing players.
No other card is named in this ruling.
#2October 4, 2004· Wizards of the Coast
This ability triggers when the spell is cast.
No other card is named in this ruling.