Is there anything preventing an opponent from revealing and putting cards in their hand after taking control of Viper's Bannermen with Seductive Promise?

bbleers said:

You mean to ask if your opponent can trigger the response of Viper's Bannermen when it leaves play under their control? They can.

Thanks Saturnine. Am I wrong to assume that if I then play Narrow Escape it would return to play under my control again, allowing me to trigger its ability again?

Again again again. Lol. Forgive my afwul typing.

bbleers said:

Cards always come into play under their owner's control (unless a card specifically says otherwise). There is no memory of Viper's Bannerman being under somebody else's control.

Saturnine said:

So it's not just that cards "always" come in to play under their owner's control (which is not strictly true, btw - consider the Honor Guards or Ten Towers); when cards leave play, they always return to their owner and are placed in the owner's corresponding out-of-play area.

ktom said:

That's why I added "unless a card specifically says otherwise"

But yes, your explanation is obviously the more accurate one, but some reason my mind didn't get there.