Mayael's Aria, Dark Depths, and Vampire Hexmage

Prerequisites

• Mayael's Aria on the battlefield
• Dark Depths on the battlefield
• Vampire Hexmage on the battlefield

Steps

1. Activate Vampire Hexmage by sacrificing it, removing all counters from Dark Depths
2. Dark Depths triggers, causing you to sacrifice it and create a 20/20 Marit Lage legendary creature token
3. At the beginning of your next upkeep, Mayael's Aria triggers, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game

Results

• Win the game at the beginning of your next upkeep