Shaman · Elemental Combat · tier 1 · from level 10

Convection

+9.9 Lightning Bolt

5/5 · level 60 · per 100 mana · and 5 more

Convection 12345

Rank 5/5

Reduces the mana cost of your Shock, Lightning Bolt, Lava Burst, and Chain Lightning spells by 10%.

Lightning Bolt +11.1% +9.9 Flame Shock +11.1% +9.1 Lava Burst +11.1% +9.0 Earth Shock +11.1% +7.3 Frost Shock +11.1% +7.2 Chain Lightning +11.1% +2.8

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.