Mayael's Aria + Devilish Valet + White Sun's Zenith

Mayael's Aria

Devilish Valet

White Sun's Zenith

How it works

1. At the beginning of your upkeep, Mayael's Aria triggers.
2. Holding priority, cast White Sun's Zenith by paying 5, creating five 1/1 Cat creature tokens and shuffling it into your library.
3. When the Cats enter the battlefield, Devilish Valet triggers that many times, doubling its power that many times, causing its power to be at least 32 until end of turn.
4. Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.

By casting White Sun's Zenith during your upkeep with enough mana, you flood the board with multiple tokens all at once. Each of those incoming creatures triggers the alliance ability of Devilish Valet repeatedly, exponentially compounding its power far beyond the required threshold. With Devilish Valet's power now astronomically high, the pending upkeep trigger from Mayael's Aria resolves, effortlessly satisfying all of its conditions to instantly hand you the victory.