another undead question

By oldskoolnoob, in 2. AGoT Rules Discussion

if i had the coldhands that says "while there is an others plot card revealed coldhands may be decleared as an attacker or defenderin any type of challenge" would the event card tyrion's cunning stop him

oldskoolnoob said:

if i had the coldhands that says "while there is an others plot card revealed coldhands may be decleared as an attacker or defenderin any type of challenge" would the event card tyrion's cunning stop him

thanks for the help