Another rogue card that got a huge glow up when Scarlet Keys and Hemlock Vale re-wrote the whole Rogue playbook.
Up to three moves as a free action is a potentially crazy power level for a level zero card. People run Shortcut to move once. People run Scout Ahead to move three times, but that costs actions and resources. (Both those cards do have other utility, which helps them earn their spots).
But as the esteemed Snacc noted when this card was released, Nimble's value is very situational unless you put some work into unlocking it. By default, the only way to intentionally start an agility test is to evade an enemy. Moving away after an evade can occasionally be a really good effect. But often enemies engage me while I'm at a location I still need to interact with, so I'm not interested in moving immediately. Also, opportunities to take 2-3 moves at once for real value are uncommon in most scenarios, and waiting for an enemy to spawn at the right time isn't reliable.
(All the same problems apply to Agility treacheries)
These days, though, you can investigate with Thieves' Kit or Forensic Kit and use this to zoom around on your own time. (Investigate a location with no clues on it if you have to). We can murder someone with a British Bull Dog and zoom away from the scene of the crime. Or Grift an aloof enemy before doing the same. This card is also the best argument I can find for actually using the Bolstering upgrade on Friends in Low Places, which will give it a wild icon letting you commit it to anything.