If multiple characters are killed simultaneously (e.g. Valar Morghulis), Margaery needs to survive, in order for her to trigger.
If a character is killed while having a King or Lord trait granted by an attachment (e.g. Crown of Gold), Margaery can trigger.
- Margaery can find a copy of a unique character that you already have in play. In this case the character will enter play as a duplicate.