The One Ring (The Lord of the Rings: Tales of Middle Earth) - Gatherer - Magic: The Gathering
The Mana Reservation Efficiency mastery has been replaced as there is now a much larger amount of Mana Reservation Efficiency for Curse Auras on the passive tree." (The mastery was 30%) :
POE 3.19] How to Fit More Auras and Fix Your Mana Cost! Mana Reservation & Cost Guide - YouTube
Path of Exile | CRAFTING GUIDE | How to Craft a Mana Reservation Efficiency HELMET - YouTube