Game data updates to the wiki have been started.
A system has been added that will automatically add divination cards and other items to the item acquisition sections where appropriate. Entries added by this system will be shown as automatic in the item acquisition section.
Some pages will need to be updated to include
upgraded_from_disabled=true if they are not eligible for the system.
Some further details on what needs to be done can be found on Path of Exile Wiki:To-do list/Automatic upgraded from and issues can be posted on the talk page.
20% increased Movement Speed if you've Killed Recently
10% reduced Damage taken while there are at least two Rare or Unique Enemies nearby
20% more Damage while there is at most one Rare or Unique Enemy nearby 
Opportunistic is a notable Ascendancy passive skill for the Assassin. It grants bonus movement speed if you've killed recently and causes your critical strikes to be unable to get reflected. It also grants more damage if there is one or no rare or unique enemies nearby or damage reduction if there are at least two rare or unique enemies nearby.
It also grants increased damage and causes critical strikes taken to not deal extra damage while there is only one enemy nearby.