Cast Beacon of Immortality by paying ({5} magic symbol) ({W} magic symbol) , doubling your life total and shuffling Beacon of Immortality into your library.
Activate Will by tapping it, reducing the cost of all white and/or blue spells you cast this turn.
Cast Debt to the Deathless, choosing for X to equal the amount of life you've gained this turn, but paying a total of ({W} magic symbol) ({W} magic symbol) ({B} magic symbol) ({B} magic symbol) due to Will's ability.
Resolve Debt to the Deathless, causing each opponent to lose twice X life, and you to gain life equal to the life lost this way.
Each opponent loses the game due to having 0 or less life.