
For a skill card to cost 5 xp, the effect must be awfully useful, and this card definitely is. It's not just that you're helping the entire team pass an annoying treachery easily; you're also permanently removing one such copy from the game, which is useful in every scenario you can think of and especially ridiculous in The Circle Undone with its "if three of these are in play, bad thing happens" treacheries - Terror in the Night, Ultimate Chaos.
And if that wasn't enough to convince you, it's practiced, meaning you can just pull it with Practice Makes Perfect on any kind of non-treachery test you're having difficulty with. Parley/evade/whatever at +4, then get the card in your hand ready for the next treachery.