Mayael's Aria, and Chameleon Colossus

Prerequisites

• Mayael's Aria on the battlefield
• Chameleon Colossus on the battlefield
• plus six available

Steps

1. At the beginning of your upkeep, Mayael's Aria triggers
2. Holding priority, activate Chameleon Colossus by paying , causing it to get +X/+X until end of turn, where X is its power
3. Repeat step 2 until Chameleon Colossus has power 20 or greater
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

Results

• Win the game