Talk:Diana/@comment-16940040-20140328165758/@comment-9533487-20140404185335

It's situational. I'm fairly certain that TF's W cannot crit, because it is purely magic damage with no physical damage mixed in.

Pick a Card is an autoattack modifier. I can see where you'd be confused though, considering it does scale its damage based off 100% AD.
 * The triggering attack will still apply on-hit effects. However, as the attack deals no physical damage, it will not benefit from life steal.
 * Critical strikes are disabled on the triggering attack.

Example:

Miss Fortune's Q cannot crit. I checked it in a custom game because, if it did, it would make it (in my opinion) worth building crit on her, or at least worth it much earlier in the game. Anyhow, with 100% (more than 100% just to be certain) crit chance, Miss Fortune's Q continued to do the exact damage displayed in the ability icon, with no bonus that indicated it had crit the auto attack portion. This is interesting, considering that both parts of MF's Q proc on hit effects such as lifesteal or Wit's End, just as if they were normal autoattacks.