: Spells you cast this turn that are white and/or blue cost less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery.
Gain life each turn, then tap Will to make your white/blue spells cost up to that much less—often casting bombs, board wipes, and big X-spells for free. You play a controlling lifegain shell that snowballs into a single explosive turn where you chain cheap spells into a game-ending payoff. Will essentially converts lifegain into mana, so the deck wants reliable, repeatable life triggers and high-impact UW spells.
Turns incidental lifegain into massive mana discounts, enabling explosive turns
UW gives premium removal, board wipes, counters, and card draw
Vigilance lets Will attack or sit back while still enabling the discount
Snowballs hard once a lifegain engine is online
Will's ability is sorcery-speed and only counts life gained that turn, so it needs setup
Heavily commander-dependent—removing Will stalls the engine
UW lacks fast ramp and direct life-total kill outside combat or combo
Vulnerable to graveyard/lifegain hate and stax that taxes activated abilities
Massive lifegain and card draw in one spell, then Will makes the rest of the turn nearly free.
Add fast mana and efficient lifegain engines (Soul Warden effects, Bolas's Citadel synergy, Sanguine Bond/Exquisite Blood with life payoffs) to reach explosive Will turns sooner. Prioritize tutors like Enlightened Tutor and Mystical Tutor to assemble Aetherflux Reservoir or Approach, and lean on protection (Teferi's Protection, Heroic Intervention analogs, counterspells) to defend your engine. Trim slow value cards for instant-speed lifegain so you can ambush-stack life and combo off in one window.
Legendary Creature — Human Wizard
: Spells you cast this turn that are white and/or blue cost 
less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery.