His text is:
Response: After you lose a challenge, move 1 gold from the treasury to The Red Viper. Challenges: Discard 1 gold from The Red Viper to stand him. Then, you may discard 1 additional gold from him to raise the claim on any player's revealed plot card by 1 until the end of the next challenge.
If I use his ability to raise claim by 1 while mid-challenge, does this stay in effect for the very next challenge as well? Or is "next challenge" really just text put in place so you could use this ability outside of a challenge? Basically, could the raised claim be in effect for potentially 2 straight challenges since "current" and "next" could have 2 different meanings?