Lets move on to the top 10
Most of your lifegain comes from permanents with low casting costs, so you'll likely have ways to gain life by the time you cast Will
For FINAL FANTASY IV, that was Dillon Deveney
Adventurer's Inn Balamb Garden, SeeD Academy Baron, Airship Kingdom Capital City Clive's Hideaway Cooking Campsite Crossroads Village Eden, Seat of the Sanctum Forest Gohn, Town of Ruin Gongaga, Reactor Town Guadosalam, Farplane Gateway Insomnia, Crown City Ishgard, the Holy See Island Jidoor, Aristocratic Capital Lindblum, Industrial Regency Midgar, City of Mako Mountain Plains Rabanastre, Royal City Sharlayan, Nation of Scholars Starting Town Swamp The Gold Saucer Treno, Dark City Vector, Imperial Capital Wastes Windurst, Federation Center Zanarkand, Ancient Metropolis
Its a life saver