Chances are not everyone here reads KI, so I'm just copying the information here:
Evoker's Roll
1 MP / tic Refresh for anything 1-9 (including Unlucky Number)
2 MP / tic Refresh for a 10
3 MP / tic Refresh for the Lucky Number
4 MP / tic Refresh for an 11
Not sure if the effect changes with a SMN in the party
Quick Draw
3 Minute cooldown
All 8 elemental shots are on the same timer
Can Miss like any other ranged attack
Consumes elemental card
and a bullet
Damage dealt to TW and IT was the same (around 130)
Unsure how the ability effects Debuffs
Cannot be Magic Bursted
Reference:
http://ffxi.killvoid.com/forums.php?m=posts&q=116768