Today during a game we had the following situation with Qarth and The only game that matters.
Qarth : Challenges: Kneel Qarth to choose 1 Dragon character you control. For the duration of the phase, that character gains an Intrigue icon and Deadly.
The only game that matters : Any Phase: Until the end of the challenge, participating characters without an [Intrigue] icon do not count their STR.
My Lannister opponent declared a Power challenge with a character, and I declared defenders with a dragon.
Then he played The only game that matters, to keep my dragon from contributing strength during the challenge because my dragon did not have an Intrigue icon, and then I used the ability on Qarth to give an Intrigue icon to my dragon so he could still contribute strength.
Is it right or did we make a mistake ?