"Am I not of the House of Eorl? I have waited on faltering feet long enough."

Éowyn, Fearless Knight

Haste
When Éowyn enters, exile target creature an opponent controls with greater power. Legendary creatures you control gain protection from each of that creature's colors until end of turn.

The Lord of the Rings: Tales of Middle-earth

Tales of Middle-earth Promos

Haste
When Éowyn, Fearless Knight enters the battlefield, exile target creature an opponent controls with greater power. Legendary creatures you control gain protection from each of that creature's colors until end of turn.

Éowyn, Fearless Knight cares about the creature's colors just before it left the battlefield. These could be different from the creature card's colors in exile (for example, if it had a copy effect applied to it on the battlefield.)