Mayael's Aria, and Mossbridge Troll

Prerequisites

• Mayael's Aria on the battlefield
• Mossbridge Troll on the battlefield
• You control at least ten power worth of creatures excluding Mossbridge Troll

Steps

1. At the beginning of your upkeep, Mayael's Aria triggers
2. Activate Mossbridge Troll by tapping creatures you control with a total power of ten or greater, giving Mossbridge Troll +20/+20
3. Resolve the Mayael's Aria trigger, winning the game

Results

• Win the game at the beginning of your next upkeep