Misinformation: "Misinformation
[Lannister Event]
House Lannister only.
Response: If an opponent would win an challenge against you, cancel the determination of challenge winner. You automatically win the challenge. "
1. Can I use this card as an attacker? (What does 'against' mean?)
2. If I use this as the defender with no defending characters, can I trigger Tower of Joy (Response: After you win a challenge with fewer participating characters than your opponent, kneel The Tower of Joy to choose and kill a character controlled by the losing opponent.)?