TL;DR: Very situational card, only for rogues that use and skills and with a good amount of "succeed by X" triggers.

Let's compare it to the other Rogue Tarot card as they compete for the same slot: The Moon • XVIII

The Moon • XVIII gives you a solid +1 for 3 resources and 1xp, with no competition to other slots.

Knight of Swords now, gives +1 on any skill, IF you succeeded, therefore:

compared to The Moon • XVIII and any other tarot, Knight of Swords doesn't help you to succeed your test in the first place.

Knight of Swords can be used for any test, so more aimed at Rogues that would use at least 2 different skills with "succeed by" triggers, as of now, mostly and skills.

I am not going to do a list of every single combination, but a selection of some interesting that came to my mind:

Weapons:

Beretta M1918, Mauser C96 to prevent exhaustion or trigger extra effect if it is your last action

Switchblade for higher extra damage rate

.41 Derringer for an extra action that you could cash in with Pay Day

Sawed-Off Shotgun for more consistency in high damages shots.

Not a weapon, but it helps you to keep your Lockpicks/Lockpicks or Suggestion in the game.

Assets:

Improves chances of double benefits of Burglary/Pickpocketing

Completely prevents bad stuff happening with the new set of assets in Edge of the earth: Blur/Divination or the fight one to be revealed soon.

Events:

Help triggering the side effects of: Breaking and Entering, Slip Away, Cheap Shot

Help recuring in your hand the upgraded: Slip Away, Cheap Shot, Backstab, Pilfer

Daring Maneuver/Daring Maneuver should also appear here as ways to make this strategy more reliable.

Skills:

Improves the payback of: "Watch this!", All In, Nimble and Momentum

Great synergy with Opportunist and the upgrades that DO help to pass the test

Conclusion:

If you plan to use the "succeed by/succeeded by" mechanism AND would like to use multiple skills (/ based on the cards we can see in the selection that use this mechanism as of the release of this box), then Knight of Swords could be a good pick, otherwise select a lvl 1 tarot card that also help you succeeding the test.

Could be useful for "Skids" O'Toole or why not Tony Morgan that doesn't have access to Ace of Swords, Winifred Habbamock that wouldn't take Sharpshooter, maybe...

Let's bet here that the new Rogue to come will be a reversed Stella Clark? Succeed by 3 or more and get an extra action? In this case this card could become a stappler.