Playing Ill Tidings with no attachments in play?

By dcdennis, in 2. AGoT Rules Discussion

Can you play Ill Tidings with no attachment cards in play (assuming of course that you kneel the maester/learned to pay the cost), for the purpose of triggering Sammy?

dcdennis said:

Can you play Ill Tidings with no attachment cards in play (assuming of course that you kneel the maester/learned to pay the cost), for the purpose of triggering Sammy?

Generally speaking, an Effect with no valid target cannot be triggered.

And that general rule applies in this case. There's nothing weird or hidden about it.

Since Ill Tidings requires you to "choose" an attachment when you play it, if there are no attachments to choose, you cannot play it.