Shaman · Restoration · tier 5 · from level 30
Nature's Swiftness
+548 Healing Wave
1/1 · level 60 · per second of casting · with Nature's Swiftness active · and 3 more
Nature's Swiftness
Rank 1/1
When activated, your next Nature spell with a casting time less than 10 sec. becomes an instant cast spell.
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.