From WoWWiki
Arcane Potency is a mage talent that increases spell critical strike chance while Clearcasting by 10% per rank, up to 30% at max rank. Clearcasting comes from the talent Arcane Concentration, which is a prerequisite. With 3 points in this talent, and a 10% chance to gain Clearcasting with Arcane Concentration, the effective critical strike increase is 3%, provided that only spells capable of critical strikes are cast while Clearcasting.
This talent has somewhat peculiar synergy with Arcane Missiles, and a mage who uses Arcane Missiles as part of his rotation can get the +crit benefit twice per Clearcast from this talent; once for a cast of Missiles that procs it, and once again for a second spell that consumes the Clearcast.
| Rank | Crit chance while Clearcasting
|
| 1 | 10%
|
| 2 | 20%
|
| 3 | 30%
|
