Assassin caster amulet

+2 to Shadow Disciples
+8% Faster Cast Rate
+25 to Life
+17 to Mana
Regenerate Mana 6%
All Resistances +18
Level 2

Twister (5/25 Charges)

Shame it isn't +2 to Assassin Skills, not that familiar with the class hence the question here.
With BladeSin getting buffed and the odd FCR breakpoints the Assassin builds have I thought this might be nice, depending on the rest of the gear.

Thanks in advance!