At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast March of the Multitudes with X=5 by tapping Devilish Valet and by paying at most {4}{G}{W}{W}, creating five 1/1 Soldier creature tokens.
When the Soldiers enter the battlefield, Devilish Valet triggers five times, doubling its power five times, causing its power to be at least 32 until end of turn.
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.

Win the game

Mayael's Aria

Devilish Valet

March of the Multitudes

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Aura Mutation by paying {G}{W}, destroying target enchantment with mana value five or greater, and creating at least five 1/1 Warrior creature tokens.
When the Warriors 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.
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.

Aura Mutation

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Grand Crescendo by paying {5}{W}{W}, creating five 1/1 Citizen creature tokens.
When the Citizens 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.
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.

Grand Crescendo

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Secure the Wastes by paying {5}{W}, creating five 1/1 Warrior creature tokens.
When the Warriors 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.
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.

Secure the Wastes

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Call the Coppercoats by paying {2}{W}, plus {1}{W} any number of times as necessary, targeting any opponent(s) who collectively control five or more creatures.
Resolve Call the Coppercoats, creating at least five 1/1 Human Soldier creature tokens.
When the Human Soldiers 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.
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.

Call the Coppercoats

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast White Sun's Zenith by paying {5}{W}{W}{W}, creating five 1/1 Cat creature tokens and shuffling it into your library.
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.
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.

White Sun's Zenith

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Avenger of Zendikar by paying {5}{G}{G}.
Avenger of Zendikar enters the battlefield, triggering itself and Devilish Valet.
Resolve the Avenger of Zendikar trigger, creating a 0/1 Plant creature token for each land you control.
Each Plant token enters the battlefield, triggering Devilish Valet that many times.
Resolve a Devilish Valet trigger, doubling its power until end of turn.
Repeat step 6 for each remaining Devilish Valet trigger.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life and win the game.

Near-infinitely powerful Devilish Valet until end of turn

Win the game at the beginning of your next upkeep

Avenger of Zendikar

Vivien, Champion of the Wilds

Activate Devilish Valet by tapping it, creating a number of 1/1 Elemental creature tokens with haste equal to its power.
When the Elementals enter the battlefield, Devilish Valet triggers that many times.
Resolve the first trigger, doubling Devilish Valet's power until end of turn.
Repeat step 3 for each remaining trigger.
Activate Pemmin's Aura's first ability by paying {U}, untapping Devilish Valet.
Repeat as desired, or as {U} persists.

Near-infinite creature tokens with haste

Near-infinite ETB

Pemmin's Aura

Elemental Mastery

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Phylath by paying {4}{R}{G}.
Phylath enters the battlefield, triggering itself and Devilish Valet.
Resolve the Phylath trigger, creating a 0/1 Plant creature token for each basic land you control.
Each Plant token enters the battlefield, triggering Devilish Valet that many times.
Resolve a Devilish Valet trigger, doubling its power until end of turn.
Repeat step 6 for each remaining Devilish Valet trigger.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life and win the game.

Phylath, World Sculptor

Vedalken Orrery

Activate Devilish Valet by tapping it, creating a number of 1/1 Elemental creature tokens with haste equal to its power.
When the Elementals enter the battlefield, Devilish Valet triggers that many times.
Resolve the first trigger, doubling Devilish Valet's power until end of turn.
Repeat step 3 for each remaining trigger.
Activate Freed from the Real's second ability by paying {U}, untapping Devilish Valet.
Repeat as desired, or as {U} persists.

Freed from the Real

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, activate Emergence Zone's second ability by paying {1} and tapping it, allowing you to cast all spells this turn as though they have flash.
Cast Phylath by paying {4}{R}{G}.
Phylath enters the battlefield, triggering itself and Devilish Valet.
Resolve the Phylath trigger, creating a 0/1 Plant creature token for each basic land you control.
Each Plant token enters the battlefield, triggering Devilish Valet that many times.
Resolve a Devilish Valet trigger, doubling its power until end of turn.
Repeat step 7 for each remaining Devilish Valet trigger.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life and win the game.

Emergence Zone

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, activate Emergence Zone's second ability by paying {1} and tapping it, allowing you to cast all spells this turn as though they have flash.
Cast Avenger of Zendikar by paying {5}{G}{G}.
Avenger of Zendikar enters the battlefield, triggering itself and Devilish Valet.
Resolve the Avenger of Zendikar trigger, creating a 0/1 Plant creature token for each land you control.
Each Plant token enters the battlefield, triggering Devilish Valet that many times.
Resolve a Devilish Valet trigger, doubling its power until end of turn.
Repeat step 7 for each remaining Devilish Valet trigger.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life and win the game.

Combos with "Devilish Valet"