Shaman · Restoration · tier 4 · from level 25

Tidal Mastery

+41.1 Riptide

5/5 · level 60 · per cast · and 4 more

Tidal Mastery 12345

Rank 5/5

Increases the critical effect chance of your healing spells by 5%.

Riptide +2.5% +41.1 Healing Wave +2.5% +40.4 Lesser Healing Wave +2.5% +20.5 Chain Heal +2.5% +12.7 Lightning Shield +2.5% +4.3

Averages, counting crits and misses, for a level 60 Shaman with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.