Mayael's Aria, and Wall of Blood

Prerequisites

• Mayael's Aria on the battlefield
• Wall of Blood on the battlefield
• Your life total is greater than or equal to twenty

Steps

1. At the beginning of your upkeep, Mayael's Aria triggers
2. Holding priority, activate Wall of Blood by paying 1 life, giving it +1/+1 until end of turn
3. Repeat step 2 until Wall of Blood's power is equal to nineteen
4. 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

Results

• Win the game at the beginning of your next upkeep